Strings Containing Neither A Nor B
Q
How to match strings that contain neither A nor B using regex?
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A
Regular Expression does not support NOT operator on a sub pattern. "Neither A nor B" must be implemented by a "Negative Look-Ahead" assertion.
Let's assume that we have following text:
The regular expression pattern will match answers that are neither A nor B, with "m" modifier:
is (?!A|B)(.)\.
(?!A|B) - look ahead for a letter neither A nor B.
(.) - capture that letter.
2016-06-23, 0👍, 0💬