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<div class="subTitle">org.apache.regexp</div>
<h2 title="Class RECompiler" class="title">Class RECompiler</h2>
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<li>java.lang.Object</li>
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<li>org.apache.regexp.RECompiler</li>
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<pre>public class <span class="strong">RECompiler</span>
extends java.lang.Object</pre>
<div class="block">A regular expression compiler class. This class compiles a pattern string into a
regular expression program interpretable by the RE evaluator class. The 'recompile'
command line tool uses this compiler to pre-compile regular expressions for use
with RE. For a description of the syntax accepted by RECompiler and what you can
do with regular expressions, see the documentation for the RE matcher class.</div>
<dl><dt><span class="strong">Version:</span></dt>
<dd>$Id: RECompiler.java 518156 2007-03-14 14:31:26Z vgritsenko $</dd>
<dt><span class="strong">Author:</span></dt>
<dd><a href="mailto:jonl@muppetlabs.com">Jonathan Locke</a>, <a href="mailto:gholam@xtra.co.nz">Michael McCallum</a></dd>
<dt><span class="strong">See Also:</span></dt><dd><a href="../../../org/apache/regexp/RE.html" title="class in org.apache.regexp"><code>RE</code></a>,
<a href="../../../org/apache/regexp/recompile.html" title="class in org.apache.regexp"><code>recompile</code></a></dd></dl>
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<td class="colFirst"><code>(package private) class </code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.RERange.html" title="class in org.apache.regexp">RECompiler.RERange</a></strong></code>
<div class="block">Local, nested class for maintaining character ranges for character classes.</div>
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<td class="colFirst"><code>(package private) int</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#bracketMin">bracketMin</a></strong></code> </td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>(package private) int</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#bracketOpt">bracketOpt</a></strong></code> </td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>(package private) static int</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#bracketUnbounded">bracketUnbounded</a></strong></code> </td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>(package private) static int</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#ESC_BACKREF">ESC_BACKREF</a></strong></code> </td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>(package private) static int</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#ESC_CLASS">ESC_CLASS</a></strong></code> </td>
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<tr class="rowColor">
<td class="colFirst"><code>(package private) static int</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#ESC_COMPLEX">ESC_COMPLEX</a></strong></code> </td>
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<tr class="altColor">
<td class="colFirst"><code>(package private) static int</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#ESC_MASK">ESC_MASK</a></strong></code> </td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>(package private) static java.util.Hashtable</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#hashPOSIX">hashPOSIX</a></strong></code> </td>
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<tr class="altColor">
<td class="colFirst"><code>(package private) int</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#idx">idx</a></strong></code> </td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>(package private) char[]</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#instruction">instruction</a></strong></code> </td>
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<tr class="altColor">
<td class="colFirst"><code>(package private) int</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#len">len</a></strong></code> </td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>(package private) int</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#lenInstruction">lenInstruction</a></strong></code> </td>
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<tr class="altColor">
<td class="colFirst"><code>(package private) static int</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#NODE_NORMAL">NODE_NORMAL</a></strong></code> </td>
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<tr class="rowColor">
<td class="colFirst"><code>(package private) static int</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#NODE_NULLABLE">NODE_NULLABLE</a></strong></code> </td>
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<td class="colFirst"><code>(package private) static int</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#NODE_TOPLEVEL">NODE_TOPLEVEL</a></strong></code> </td>
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<tr class="rowColor">
<td class="colFirst"><code>(package private) int</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#parens">parens</a></strong></code> </td>
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<td class="colFirst"><code>(package private) java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#pattern">pattern</a></strong></code> </td>
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<td class="colOne"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#RECompiler()">RECompiler</a></strong>()</code>
<div class="block">Constructor.</div>
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<td class="colFirst"><code>(package private) int</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#atom()">atom</a></strong>()</code>
<div class="block">Absorb an atomic character string.</div>
</td>
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<td class="colFirst"><code>(package private) void</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#bracket()">bracket</a></strong>()</code>
<div class="block">Match bracket {m,n} expression put results in bracket member variables</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>(package private) int</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#branch(int[])">branch</a></strong>(int[] flags)</code>
<div class="block">Compile body of one branch of an or operator (implements concatenation)</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>(package private) int</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#characterClass()">characterClass</a></strong>()</code>
<div class="block">Compile a character class</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>(package private) int</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#closure(int[])">closure</a></strong>(int[] flags)</code>
<div class="block">Compile a possibly closured terminal</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../org/apache/regexp/REProgram.html" title="class in org.apache.regexp">REProgram</a></code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#compile(java.lang.String)">compile</a></strong>(java.lang.String pattern)</code>
<div class="block">Compiles a regular expression pattern into a program runnable by the pattern
matcher class 'RE'.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>(package private) void</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#emit(char)">emit</a></strong>(char c)</code>
<div class="block">Emit a single character into the program stream.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>(package private) void</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#ensure(int)">ensure</a></strong>(int n)</code>
<div class="block">Ensures that n more characters can fit in the program buffer.</div>
</td>
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<td class="colFirst"><code>(package private) int</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#escape()">escape</a></strong>()</code>
<div class="block">Match an escape sequence.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>(package private) int</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#expr(int[])">expr</a></strong>(int[] flags)</code>
<div class="block">Compile an expression with possible parens around it.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>(package private) void</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#internalError()">internalError</a></strong>()</code>
<div class="block">Throws a new internal error exception</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>(package private) int</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#node(char, int)">node</a></strong>(char opcode,
int opdata)</code>
<div class="block">Adds a new node</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>(package private) void</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#nodeInsert(char, int, int)">nodeInsert</a></strong>(char opcode,
int opdata,
int insertAt)</code>
<div class="block">Inserts a node with a given opcode and opdata at insertAt.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>(package private) void</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#setNextOfEnd(int, int)">setNextOfEnd</a></strong>(int node,
int pointTo)</code>
<div class="block">Appends a node to the end of a node chain</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>(package private) void</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#syntaxError(java.lang.String)">syntaxError</a></strong>(java.lang.String s)</code>
<div class="block">Throws a new syntax error exception</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>(package private) int</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/regexp/RECompiler.html#terminal(int[])">terminal</a></strong>(int[] flags)</code>
<div class="block">Match a terminal node.</div>
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<h3>Methods inherited from class java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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<h4>instruction</h4>
<pre>char[] instruction</pre>
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<pre>int lenInstruction</pre>
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<h4>pattern</h4>
<pre>java.lang.String pattern</pre>
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<pre>int len</pre>
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<pre>int idx</pre>
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<h4>parens</h4>
<pre>int parens</pre>
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<pre>static final int NODE_NORMAL</pre>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../constant-values.html#org.apache.regexp.RECompiler.NODE_NORMAL">Constant Field Values</a></dd></dl>
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<pre>static final int NODE_NULLABLE</pre>
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<pre>static final int NODE_TOPLEVEL</pre>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../constant-values.html#org.apache.regexp.RECompiler.NODE_TOPLEVEL">Constant Field Values</a></dd></dl>
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<pre>static final int ESC_MASK</pre>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../constant-values.html#org.apache.regexp.RECompiler.ESC_MASK">Constant Field Values</a></dd></dl>
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<pre>static final int ESC_BACKREF</pre>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../constant-values.html#org.apache.regexp.RECompiler.ESC_BACKREF">Constant Field Values</a></dd></dl>
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<h4>ESC_COMPLEX</h4>
<pre>static final int ESC_COMPLEX</pre>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../constant-values.html#org.apache.regexp.RECompiler.ESC_COMPLEX">Constant Field Values</a></dd></dl>
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<h4>ESC_CLASS</h4>
<pre>static final int ESC_CLASS</pre>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../constant-values.html#org.apache.regexp.RECompiler.ESC_CLASS">Constant Field Values</a></dd></dl>
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<h4>bracketUnbounded</h4>
<pre>static final int bracketUnbounded</pre>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../constant-values.html#org.apache.regexp.RECompiler.bracketUnbounded">Constant Field Values</a></dd></dl>
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<h4>bracketMin</h4>
<pre>int bracketMin</pre>
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<h4>bracketOpt</h4>
<pre>int bracketOpt</pre>
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<h4>hashPOSIX</h4>
<pre>static final java.util.Hashtable hashPOSIX</pre>
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<h4>RECompiler</h4>
<pre>public RECompiler()</pre>
<div class="block">Constructor. Creates (initially empty) storage for a regular expression program.</div>
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<h4>ensure</h4>
<pre>void ensure(int n)</pre>
<div class="block">Ensures that n more characters can fit in the program buffer.
If n more can't fit, then the size is doubled until it can.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>n</code> - Number of additional characters to ensure will fit.</dd></dl>
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<pre>void emit(char c)</pre>
<div class="block">Emit a single character into the program stream.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>c</code> - Character to add</dd></dl>
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<pre>void nodeInsert(char opcode,
int opdata,
int insertAt)</pre>
<div class="block">Inserts a node with a given opcode and opdata at insertAt. The node relative next
pointer is initialized to 0.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>opcode</code> - Opcode for new node</dd><dd><code>opdata</code> - Opdata for new node (only the low 16 bits are currently used)</dd><dd><code>insertAt</code> - Index at which to insert the new node in the program</dd></dl>
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<pre>void setNextOfEnd(int node,
int pointTo)</pre>
<div class="block">Appends a node to the end of a node chain</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>node</code> - Start of node chain to traverse</dd><dd><code>pointTo</code> - Node to have the tail of the chain point to</dd></dl>
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<pre>int node(char opcode,
int opdata)</pre>
<div class="block">Adds a new node</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>opcode</code> - Opcode for node</dd><dd><code>opdata</code> - Opdata for node (only the low 16 bits are currently used)</dd>
<dt><span class="strong">Returns:</span></dt><dd>Index of new node in program</dd></dl>
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<h4>internalError</h4>
<pre>void internalError()
throws java.lang.Error</pre>
<div class="block">Throws a new internal error exception</div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.Error</code> - Thrown in the event of an internal error.</dd></dl>
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<pre>void syntaxError(java.lang.String s)
throws <a href="../../../org/apache/regexp/RESyntaxException.html" title="class in org.apache.regexp">RESyntaxException</a></pre>
<div class="block">Throws a new syntax error exception</div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../org/apache/regexp/RESyntaxException.html" title="class in org.apache.regexp">RESyntaxException</a></code> - Thrown if the regular expression has invalid syntax.</dd></dl>
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<h4>bracket</h4>
<pre>void bracket()
throws <a href="../../../org/apache/regexp/RESyntaxException.html" title="class in org.apache.regexp">RESyntaxException</a></pre>
<div class="block">Match bracket {m,n} expression put results in bracket member variables</div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../org/apache/regexp/RESyntaxException.html" title="class in org.apache.regexp">RESyntaxException</a></code> - Thrown if the regular expression has invalid syntax.</dd></dl>
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<h4>escape</h4>
<pre>int escape()
throws <a href="../../../org/apache/regexp/RESyntaxException.html" title="class in org.apache.regexp">RESyntaxException</a></pre>
<div class="block">Match an escape sequence. Handles quoted chars and octal escapes as well
as normal escape characters. Always advances the input stream by the
right amount. This code "understands" the subtle difference between an
octal escape and a backref. You can access the type of ESC_CLASS or
ESC_COMPLEX or ESC_BACKREF by looking at pattern[idx - 1].</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>ESC_* code or character if simple escape</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../org/apache/regexp/RESyntaxException.html" title="class in org.apache.regexp">RESyntaxException</a></code> - Thrown if the regular expression has invalid syntax.</dd></dl>
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<h4>characterClass</h4>
<pre>int characterClass()
throws <a href="../../../org/apache/regexp/RESyntaxException.html" title="class in org.apache.regexp">RESyntaxException</a></pre>
<div class="block">Compile a character class</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>Index of class node</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../org/apache/regexp/RESyntaxException.html" title="class in org.apache.regexp">RESyntaxException</a></code> - Thrown if the regular expression has invalid syntax.</dd></dl>
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<h4>atom</h4>
<pre>int atom()
throws <a href="../../../org/apache/regexp/RESyntaxException.html" title="class in org.apache.regexp">RESyntaxException</a></pre>
<div class="block">Absorb an atomic character string. This method is a little tricky because
it can un-include the last character of string if a closure operator follows.
This is correct because *+? have higher precedence than concatentation (thus
ABC* means AB(C*) and NOT (ABC)*).</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>Index of new atom node</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../org/apache/regexp/RESyntaxException.html" title="class in org.apache.regexp">RESyntaxException</a></code> - Thrown if the regular expression has invalid syntax.</dd></dl>
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<h4>terminal</h4>
<pre>int terminal(int[] flags)
throws <a href="../../../org/apache/regexp/RESyntaxException.html" title="class in org.apache.regexp">RESyntaxException</a></pre>
<div class="block">Match a terminal node.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>flags</code> - Flags</dd>
<dt><span class="strong">Returns:</span></dt><dd>Index of terminal node (closeable)</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../org/apache/regexp/RESyntaxException.html" title="class in org.apache.regexp">RESyntaxException</a></code> - Thrown if the regular expression has invalid syntax.</dd></dl>
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<h4>closure</h4>
<pre>int closure(int[] flags)
throws <a href="../../../org/apache/regexp/RESyntaxException.html" title="class in org.apache.regexp">RESyntaxException</a></pre>
<div class="block">Compile a possibly closured terminal</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>flags</code> - Flags passed by reference</dd>
<dt><span class="strong">Returns:</span></dt><dd>Index of closured node</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../org/apache/regexp/RESyntaxException.html" title="class in org.apache.regexp">RESyntaxException</a></code> - Thrown if the regular expression has invalid syntax.</dd></dl>
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<h4>branch</h4>
<pre>int branch(int[] flags)
throws <a href="../../../org/apache/regexp/RESyntaxException.html" title="class in org.apache.regexp">RESyntaxException</a></pre>
<div class="block">Compile body of one branch of an or operator (implements concatenation)</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>flags</code> - Flags passed by reference</dd>
<dt><span class="strong">Returns:</span></dt><dd>Pointer to first node in the branch</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../org/apache/regexp/RESyntaxException.html" title="class in org.apache.regexp">RESyntaxException</a></code> - Thrown if the regular expression has invalid syntax.</dd></dl>
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<h4>expr</h4>
<pre>int expr(int[] flags)
throws <a href="../../../org/apache/regexp/RESyntaxException.html" title="class in org.apache.regexp">RESyntaxException</a></pre>
<div class="block">Compile an expression with possible parens around it. Paren matching
is done at this level so we can tie the branch tails together.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>flags</code> - Flag value passed by reference</dd>
<dt><span class="strong">Returns:</span></dt><dd>Node index of expression in instruction array</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../org/apache/regexp/RESyntaxException.html" title="class in org.apache.regexp">RESyntaxException</a></code> - Thrown if the regular expression has invalid syntax.</dd></dl>
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<h4>compile</h4>
<pre>public <a href="../../../org/apache/regexp/REProgram.html" title="class in org.apache.regexp">REProgram</a> compile(java.lang.String pattern)
throws <a href="../../../org/apache/regexp/RESyntaxException.html" title="class in org.apache.regexp">RESyntaxException</a></pre>
<div class="block">Compiles a regular expression pattern into a program runnable by the pattern
matcher class 'RE'.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>pattern</code> - Regular expression pattern to compile (see RECompiler class
for details).</dd>
<dt><span class="strong">Returns:</span></dt><dd>A compiled regular expression program.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../org/apache/regexp/RESyntaxException.html" title="class in org.apache.regexp">RESyntaxException</a></code> - Thrown if the regular expression has invalid syntax.</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../org/apache/regexp/RECompiler.html" title="class in org.apache.regexp"><code>RECompiler</code></a>,
<a href="../../../org/apache/regexp/RE.html" title="class in org.apache.regexp"><code>RE</code></a></dd></dl>
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