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Re: Basic Regular expressionby hippo (Bishop) |
| on Feb 09, 2017 at 16:31 UTC ( [id://1181547]=note: print w/replies, xml ) | Need Help?? |
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$2 cannot be null, it must be either "e" or "r" or else the entire regex would fail to match. Hopefully the rest becomes obvious once you understand this part?
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