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Editorial Team
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Asked: 2026-06-17T16:23:34+00:00

I am trying to find a regular expression for mobile phones that gives me

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I am trying to find a regular expression for mobile phones that gives me 07550440002 or +4475504400003 up to 20 characters, i.e. I want a regular expression that may + or may not and then a whole number. I have ^(\+?[0-9])$ but I keep on getting the error message unexpected quantifier.

This happens when I try and run the follwowing code –

if (!$(textBox).val().match(RestrictionRegularExpressions.MOBILEPHONE)) {

Where RestrictionRegularExpressions.MOBILEPHONE is set the above reg expression

I don’t think it likes the \+.

This is using JQuery/Javascript

Any help would be greatly appreciated.

Thanks

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1 Answer

  1. Editorial Team

    I believe that the given regular expression does not work because the backslash needs to be escaped as well. Using a double backslash should do the trick.

    The following regular expression worked for me:

    ^\\+?[0-9]{0,20}$

    Which I tested using this page on W3Schools web-page: http://www.w3schools.com/js/tryit.asp?filename=tryjs_regexp_test. It accepts 0 to 20 numbers prefixed by an optional ‘+’ sign.

    Hope that helps

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