And that's going to prevent you from danger exactly how?
There are two potential dangers when running user supplied
regexes. 1) arbitrary code injection and 2) resource exhaustion. 1) is not possible by default,
only if you enable use re 'eval', or use string
eval (which isn't done by the OP). 2) is a more serious problem, and can be archieved with the limited of characters
you propose.
Abigail
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