Say the string not equal to foo nor bar. How to write the regex?
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1`^(?!(?:foo|bar)$)` or `^(?!(?:foo|bar)$).*` – Wiktor Stribiżew Oct 23 '17 at 09:03
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@WiktorStribiżew Although I don't understand it, it works. – bijiDango Oct 23 '17 at 09:05
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Paste into http://regex101.com and read the explanation on the right. – Wiktor Stribiżew Oct 23 '17 at 09:06