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A comment on Is there a regular expression to detect a valid regular expression?. Parent comment

Re:Is there a regular expression to detect a valid regular e... by unlinkr on Sunday September 08, 2019 @10:01AM (#20910598)
It only works in practice, not in theory.
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Re:Is there a regular expression to detect a valid regular e... by yifanl on Monday September 09, 2019 @08:34AM (#20917503)
It doesnt work in practice, PCRE does not validate all valid PCRE expressions.
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