One of the things about regexes is that they are (generally) not regular in two senses of the word:
1) they have different syntax for perl/PCRE, Python, Emacs, Vim, ...;
2) they are not regular in the linguistic/CompSci sense of the "regular languages", and even when they are, backtracking parsers are (almost always) used on them and this can lead to denial-of-service bugs :(
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One of the things about regexes is that they are (generally) not regular in two senses of the word:
1) they have different syntax for perl/PCRE, Python, Emacs, Vim, ...;
2) they are not regular in the linguistic/CompSci sense of the "regular languages", and even when they are, backtracking parsers are (almost always) used on them and this can lead to denial-of-service bugs :(