query: How to validate whether a regex itself is valid or not?
positive_passages.docid: 2559
positive_passages.text: Is there a regular expression to detect a valid regular expression?
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negative_passages.text: JavaScript regular expressions and sub-matches
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negative_passages.text: Determining if a URI is valid using Perl regex
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negative_passages.text: How does this regular expression work?
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negative_passages.text: Regular expressions match floating point number but not integer
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negative_passages.text: Case insensitive regular expression without re.compile?
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negative_passages.text: Validate that string contains only allowed characters in Ruby