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Asked: 2026-06-17T09:37:06+00:00

I have a custom regular expression attribute which implements IClientValidate so that I can

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I have a custom regular expression attribute which implements IClientValidate so that I can use it with unobtrustive validate.

When I run it I get the following error in FireBug

SyntaxError: Invalid quantifier
match = new RegExp(params).exec(value);

It obviously does not like the regular expression that is passed to it, it is valid in C#. I can’t seem to work out what I need to do to get it to be valid in JavaScript.

The regex is

^(?i)([A-PR-UWYZ0-9][A-HK-Y0-9][AEHMNPRTVXY0-9]?[ABEHMNPRVWXY0-9]?\s?[0-9][ABD-HJLN-UW-Z]{2})$

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1 Answer

  1. Editorial Team

    The JavaScript regex flavor is extremely limited compared to .NET (C#). One of the many features it doesn’t support is inline modifiers of the form (?i)regex or (?i:regex). However, because you’re using the new RegExp(params) constructor, you should be able to pass the modifier as the second parameter:

    "^[A-PR-UWYZ0-9][A-HK-Y0-9][AEHMNPRTVXY0-9]?[ABEHMNPRVWXY0-9]?\s?[0-9][ABD-HJLN-UW-Z]{2}$",
"i"
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