Top SO users from Warsaw
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Common Regex Issues
[Ensuring `b` doesn't come between `a` and `c`][2]
[Why is this regex allowing a caret?][3]
[How Negative Lookahead Works](http://stackoverflow.com/questions/31201690/find-word-not-followed-by/31201710#31201710) ([more here](http://stackoverflow.com/questions/32886477/regexp-find-numbers-in-a-string-in-any-order/32886855#32886855))
[Backtracking with greedy/lazy/possessive quantifiers][4]
[Why `=` or `"` breaks PHP regexp when using `\b`?][5] (not only related to PHP)
Common Language Specific Regex Issues
[JavaScript `String#match` with global flag does not return captured texts](http://stackoverflow.com/a/32652772/3832970)
[Unrolling the loop regex technique][6]
**Python 2 (and 3) Unicode regex issues**: [Answer 1][7], [Answer 2][8] *(Japanese!)*, [Answer 3][9] *(Hebrew!)*
Regex Tester Related Issues
[`Regexr.com` shows my regex ***can match 0 characters, and therefore matches infinitely***](http://stackoverflow.com/questions/34495675/zero-length-regexes-and-infinite-matches/34495840#34495840)
