Question 51768 in Javascript Question posted in
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JavaScript Regex match with no match

I have a RegEx ^(?:(?:3[0-9][0-9]{6,9})|(?:0[1-9][0-9]{6,9}))$ which works fine. But I want to add an excision of a specific number: (?!(?:315678901))$ This works fine on its own. But combining the two messes the expression up.
Any ideas?

I was using it to include certain (Italian), phone numbers, but exclude one specific phone number.

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2

Answers


  1. 0

    You can combine the two expressions using a positive lookahead assertion (?!…) to exclude the specific number 315678901 from the original expression. The resulting regular expression would be:

    ^(?:(?!315678901)(?:3[0-9][0-9]{6,9})|(?:0[1-9][0-9]{6,9}))$

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  2. 0

    Use: ^(?!315678901$)(?:3d|0[1-9])d{6,9}$

    Here (?!315678901$) filters out exactly 315678901 and allows for other numbers matched by your expression. It also allows for numbers beginning with 315678901, but not 315678901.

    Also, I compacted your alteration group to (?:3d|0[1-9])d{6,9}

    Demo at regex101.

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