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regexnumbers
Ilia Ross
Ilia Ross

Reputation: 13412

Regexp to take all numbers from the string in JavaScript and php

Was playing around with regexp to remove all numbers from string

I came up to this:

   /([^0-9])$/

But it works only if string looks like this, e.g. Name123 but if you enter Name123Name than it doesn't work?

Can't understand why?

Any ideas?

Best regards, Ilia

Upvotes: 0

Views: 77

Answers (2)

Mark Byers
Mark Byers

Reputation: 838416

Your regular expression finds one character not in [0-9] at the end of the string.

To check if there is a digit anywhere in the string, remove the anchors:

/[0-9]/

To check that all characters are not digits, add a start of string anchor too:

/^[^0-9]+$/

This approach is called a blacklist - a list of characters you don't want to allow. Note that it's often better to create a whitelist instead - a list characters that you do want to allow.

Upvotes: 4

John Corbett
John Corbett

Reputation: 1615

remove the $ at the end, because that matches the end of the string. Also you can use \d to match a digit instead of [0-9] depending on the language you're using.

so in your example /[0-9]$/ matches Name123 because the 123 appears at the end of the string, thus matches the $ anchor. But in the other example, Name123Name, the $ anchor doesn't match because the digits are in the middle of the string.

Upvotes: 1

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