Comment on Is there a regular expression to detect a valid regular expression? (2008)Comments−a-dub2yprotip: a language is not regular if you need counter(s) to parse it.protip 2: good regex implementations often have extensions that support counters.
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protip: a language is not regular if you need counter(s) to parse it.
protip 2: good regex implementations often have extensions that support counters.