R | |
| Regex_compile_failed [Regex.Exceptions] | Regex_rewrite_template_invalid (template, error_msg)
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| Regex_match_failed [Regex.Exceptions] | Regex_submatch_did_not_capture (s, i) means the ith subpattern in the
regex compiled from s did not capture a substring.
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| Regex_no_such_named_subpattern [Regex.Exceptions] | Match_failed pattern
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| Regex_no_such_subpattern [Regex.Exceptions] | Regex_no_such_subpattern (n, max) means n was requested but only max
subpatterns are defined (so max - 1 is the highest valid index)
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| Regex_rewrite_template_invalid [Regex.Exceptions] | |
| Regex_submatch_did_not_capture [Regex.Exceptions] |
the string is the C library's error message, generally in the form of
"(human-readable error): (piece of pattern that did not compile)"
|