/usr/include/tcl8.4/tcl-private/generic/regerrs.h is in tcl8.4-dev 8.4.20-8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | { REG_OKAY, "REG_OKAY", "no errors detected" },
{ REG_NOMATCH, "REG_NOMATCH", "failed to match" },
{ REG_BADPAT, "REG_BADPAT", "invalid regexp (reg version 0.8)" },
{ REG_ECOLLATE, "REG_ECOLLATE", "invalid collating element" },
{ REG_ECTYPE, "REG_ECTYPE", "invalid character class" },
{ REG_EESCAPE, "REG_EESCAPE", "invalid escape \\ sequence" },
{ REG_ESUBREG, "REG_ESUBREG", "invalid backreference number" },
{ REG_EBRACK, "REG_EBRACK", "brackets [] not balanced" },
{ REG_EPAREN, "REG_EPAREN", "parentheses () not balanced" },
{ REG_EBRACE, "REG_EBRACE", "braces {} not balanced" },
{ REG_BADBR, "REG_BADBR", "invalid repetition count(s)" },
{ REG_ERANGE, "REG_ERANGE", "invalid character range" },
{ REG_ESPACE, "REG_ESPACE", "out of memory" },
{ REG_BADRPT, "REG_BADRPT", "quantifier operand invalid" },
{ REG_ASSERT, "REG_ASSERT", "\"can't happen\" -- you found a bug" },
{ REG_INVARG, "REG_INVARG", "invalid argument to regex function" },
{ REG_MIXED, "REG_MIXED", "character widths of regex and string differ" },
{ REG_BADOPT, "REG_BADOPT", "invalid embedded option" },
{ REG_ETOOBIG, "REG_ETOOBIG", "nfa has too many states" },
{ REG_ECOLORS, "REG_ECOLORS", "too many colors" },
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