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Editorial Team
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Asked: 2026-05-13T07:38:57+00:00

I am wanting to create a regular expression for the following scenario: If a

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I am wanting to create a regular expression for the following scenario:

If a string contains the percentage character (%) then it can only contain the following: %20, and cannot be preceded by another ‘%‘.

So if there was for instance, %25 it would be rejected. For instance, the following string would be valid:

http://www.test.com/?&Name=My%20Name%20Is%20Vader

But these would fail:

http://www.test.com/?&Name=My%20Name%20Is%20VadersAccountant%25

%%%25

Any help would be greatly appreciated,

Kyle

EDIT:

The scenario in a nutshell is that a link is written to an encoded state and then launched via JavaScript. No decoding works. I tried .net decoding and JS decoding, each having the same result – The results stay encoded when executed.

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1 Answer

  1. Editorial Team

    Doesn’t require a %:

    /^[^%]*(%20[^%]*)*$/
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