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REG_OKAY, "REG_OKAY", "no errors detected",
REG_NOMATCH, "REG_NOMATCH", "failed to match",
REG_BADPAT, "REG_BADPAT", "invalid regexp (reg version 0.1)",
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_IMPOSS, "REG_IMPOSS", "can never match",
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