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<p>
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<a name="FAQ-1"></a>
<h2 class="unnumbered">FAQ</h2>

<p>From time to time, the <code>flex</code> maintainer receives certain
questions. Rather than repeat answers to well-understood problems, we
publish them here.
</p>
<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top">&bull; <a href="When-was-flex-born_003f.html#When-was-flex-born_003f" accesskey="1">When was flex born?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="How-do-I-expand-backslash_002descape-sequences-in-C_002dstyle-quoted-strings_003f.html#How-do-I-expand-backslash_002descape-sequences-in-C_002dstyle-quoted-strings_003f" accesskey="2">How do I expand backslash-escape sequences in C-style quoted strings?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Why-do-flex-scanners-call-fileno-if-it-is-not-ANSI-compatible_003f.html#Why-do-flex-scanners-call-fileno-if-it-is-not-ANSI-compatible_003f" accesskey="3">Why do flex scanners call fileno if it is not ANSI compatible?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Does-flex-support-recursive-pattern-definitions_003f.html#Does-flex-support-recursive-pattern-definitions_003f" accesskey="4">Does flex support recursive pattern definitions?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="How-do-I-skip-huge-chunks-of-input-_0028tens-of-megabytes_0029-while-using-flex_003f.html#How-do-I-skip-huge-chunks-of-input-_0028tens-of-megabytes_0029-while-using-flex_003f" accesskey="5">How do I skip huge chunks of input (tens of megabytes) while using flex?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Flex-is-not-matching-my-patterns-in-the-same-order-that-I-defined-them_002e.html#Flex-is-not-matching-my-patterns-in-the-same-order-that-I-defined-them_002e" accesskey="6">Flex is not matching my patterns in the same order that I defined them.</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="My-actions-are-executing-out-of-order-or-sometimes-not-at-all_002e.html#My-actions-are-executing-out-of-order-or-sometimes-not-at-all_002e" accesskey="7">My actions are executing out of order or sometimes not at all.</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="How-can-I-have-multiple-input-sources-feed-into-the-same-scanner-at-the-same-time_003f.html#How-can-I-have-multiple-input-sources-feed-into-the-same-scanner-at-the-same-time_003f" accesskey="8">How can I have multiple input sources feed into the same scanner at the same time?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Can-I-build-nested-parsers-that-work-with-the-same-input-file_003f.html#Can-I-build-nested-parsers-that-work-with-the-same-input-file_003f" accesskey="9">Can I build nested parsers that work with the same input file?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="How-can-I-match-text-only-at-the-end-of-a-file_003f.html#How-can-I-match-text-only-at-the-end-of-a-file_003f">How can I match text only at the end of a file?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="How-can-I-make-REJECT-cascade-across-start-condition-boundaries_003f.html#How-can-I-make-REJECT-cascade-across-start-condition-boundaries_003f">How can I make REJECT cascade across start condition boundaries?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Why-cant-I-use-fast-or-full-tables-with-interactive-mode_003f.html#Why-cant-I-use-fast-or-full-tables-with-interactive-mode_003f">Why cant I use fast or full tables with interactive mode?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="How-much-faster-is-_002dF-or-_002df-than-_002dC_003f.html#How-much-faster-is-_002dF-or-_002df-than-_002dC_003f">How much faster is -F or -f than -C?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="If-I-have-a-simple-grammar-cant-I-just-parse-it-with-flex_003f.html#If-I-have-a-simple-grammar-cant-I-just-parse-it-with-flex_003f">If I have a simple grammar cant I just parse it with flex?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Why-doesn_0027t-yyrestart_0028_0029-set-the-start-state-back-to-INITIAL_003f.html#Why-doesn_0027t-yyrestart_0028_0029-set-the-start-state-back-to-INITIAL_003f">Why doesn't yyrestart() set the start state back to INITIAL?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="How-can-I-match-C_002dstyle-comments_003f.html#How-can-I-match-C_002dstyle-comments_003f">How can I match C-style comments?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="The-period-isn_0027t-working-the-way-I-expected_002e.html#The-period-isn_0027t-working-the-way-I-expected_002e">The period isn't working the way I expected.</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Can-I-get-the-flex-manual-in-another-format_003f.html#Can-I-get-the-flex-manual-in-another-format_003f">Can I get the flex manual in another format?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Does-there-exist-a-_0022faster_0022-NDFA_002d_003eDFA-algorithm_003f.html#Does-there-exist-a-_0022faster_0022-NDFA_002d_003eDFA-algorithm_003f">Does there exist a &quot;faster&quot; NDFA-&gt;DFA algorithm?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="How-does-flex-compile-the-DFA-so-quickly_003f.html#How-does-flex-compile-the-DFA-so-quickly_003f">How does flex compile the DFA so quickly?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="How-can-I-use-more-than-8192-rules_003f.html#How-can-I-use-more-than-8192-rules_003f">How can I use more than 8192 rules?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="How-do-I-abandon-a-file-in-the-middle-of-a-scan-and-switch-to-a-new-file_003f.html#How-do-I-abandon-a-file-in-the-middle-of-a-scan-and-switch-to-a-new-file_003f">How do I abandon a file in the middle of a scan and switch to a new file?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="How-do-I-execute-code-only-during-initialization-_0028only-before-the-first-scan_0029_003f.html#How-do-I-execute-code-only-during-initialization-_0028only-before-the-first-scan_0029_003f">How do I execute code only during initialization (only before the first scan)?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="How-do-I-execute-code-at-termination_003f.html#How-do-I-execute-code-at-termination_003f">How do I execute code at termination?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Where-else-can-I-find-help_003f.html#Where-else-can-I-find-help_003f">Where else can I find help?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Can-I-include-comments-in-the-_0022rules_0022-section-of-the-file_003f.html#Can-I-include-comments-in-the-_0022rules_0022-section-of-the-file_003f">Can I include comments in the &quot;rules&quot; section of the file?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="I-get-an-error-about-undefined-yywrap_0028_0029_002e.html#I-get-an-error-about-undefined-yywrap_0028_0029_002e">I get an error about undefined yywrap().</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="How-can-I-change-the-matching-pattern-at-run-time_003f.html#How-can-I-change-the-matching-pattern-at-run-time_003f">How can I change the matching pattern at run time?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="How-can-I-expand-macros-in-the-input_003f.html#How-can-I-expand-macros-in-the-input_003f">How can I expand macros in the input?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="How-can-I-build-a-two_002dpass-scanner_003f.html#How-can-I-build-a-two_002dpass-scanner_003f">How can I build a two-pass scanner?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="How-do-I-match-any-string-not-matched-in-the-preceding-rules_003f.html#How-do-I-match-any-string-not-matched-in-the-preceding-rules_003f">How do I match any string not matched in the preceding rules?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="I-am-trying-to-port-code-from-AT_0026T-lex-that-uses-yysptr-and-yysbuf_002e.html#I-am-trying-to-port-code-from-AT_0026T-lex-that-uses-yysptr-and-yysbuf_002e">I am trying to port code from AT&amp;T lex that uses yysptr and yysbuf.</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Is-there-a-way-to-make-flex-treat-NULL-like-a-regular-character_003f.html#Is-there-a-way-to-make-flex-treat-NULL-like-a-regular-character_003f">Is there a way to make flex treat NULL like a regular character?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Whenever-flex-can-not-match-the-input-it-says-_0022flex-scanner-jammed_0022_002e.html#Whenever-flex-can-not-match-the-input-it-says-_0022flex-scanner-jammed_0022_002e">Whenever flex can not match the input it says &quot;flex scanner jammed&quot;.</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Why-doesn_0027t-flex-have-non_002dgreedy-operators-like-perl-does_003f.html#Why-doesn_0027t-flex-have-non_002dgreedy-operators-like-perl-does_003f">Why doesn't flex have non-greedy operators like perl does?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Memory-leak-_002d-16386-bytes-allocated-by-malloc_002e.html#Memory-leak-_002d-16386-bytes-allocated-by-malloc_002e">Memory leak - 16386 bytes allocated by malloc.</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="How-do-I-track-the-byte-offset-for-lseek_0028_0029_003f.html#How-do-I-track-the-byte-offset-for-lseek_0028_0029_003f">How do I track the byte offset for lseek()?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="How-do-I-use-my-own-I_002fO-classes-in-a-C_002b_002b-scanner_003f.html#How-do-I-use-my-own-I_002fO-classes-in-a-C_002b_002b-scanner_003f">How do I use my own I/O classes in a C++ scanner?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="How-do-I-skip-as-many-chars-as-possible_003f.html#How-do-I-skip-as-many-chars-as-possible_003f">How do I skip as many chars as possible?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="deleteme00.html#deleteme00">deleteme00</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Are-certain-equivalent-patterns-faster-than-others_003f.html#Are-certain-equivalent-patterns-faster-than-others_003f">Are certain equivalent patterns faster than others?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Is-backing-up-a-big-deal_003f.html#Is-backing-up-a-big-deal_003f">Is backing up a big deal?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Can-I-fake-multi_002dbyte-character-support_003f.html#Can-I-fake-multi_002dbyte-character-support_003f">Can I fake multi-byte character support?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="deleteme01.html#deleteme01">deleteme01</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Can-you-discuss-some-flex-internals_003f.html#Can-you-discuss-some-flex-internals_003f">Can you discuss some flex internals?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="unput_0028_0029-messes-up-yy_005fat_005fbol.html#unput_0028_0029-messes-up-yy_005fat_005fbol">unput() messes up yy_at_bol</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="The-_007c-operator-is-not-doing-what-I-want.html#The-_007c-operator-is-not-doing-what-I-want">The | operator is not doing what I want</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Why-can_0027t-flex-understand-this-variable-trailing-context-pattern_003f.html#Why-can_0027t-flex-understand-this-variable-trailing-context-pattern_003f">Why can't flex understand this variable trailing context pattern?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="The-_005e-operator-isn_0027t-working.html#The-_005e-operator-isn_0027t-working">The ^ operator isn't working</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Trailing-context-is-getting-confused-with-trailing-optional-patterns.html#Trailing-context-is-getting-confused-with-trailing-optional-patterns">Trailing context is getting confused with trailing optional patterns</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
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</table>

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