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Editorial Team
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Asked: 2026-05-17T19:02:28+00:00

I am using below code snippet to validate my input string with: only capital

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I am using below code snippet to validate my input string with: only capital letters, numbers and two special characters (those are & and Ñ) & without any space between.

var validpattern = new RegExp('[^A-Z0-9\d&Ñ]');
if (enteredID.match(validpattern))
   isvalidChars = true;
else
   isvalidChars = false;

Test 1: "XAXX0101%&&$#" should fail i.e isvalidChars = false; (as it contains invalid characters like %$#.

Test 2: "XAXX0101&Ñ3Ñ&" should pass.

Test 3: "XA 87B" should fail as it contains space in between

The above code is not working, Can any one help me rectifying the above regex.

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1 Answer

  1. Editorial Team

    This is happening because you have a negation(^) inside the character class.

    What you want is: ^[A-Z0-9&Ñ]+$ or ^[A-Z\d&Ñ]+$

    Changes made:

    • [0-9] is same as \d. So use
      either of them, not both, although it’s not incorrect to use both, it’s redundant.
    • Added start anchor (^) and end
      anchor($) to match the entire
      string not part of it.
    • Added a quantifier +, as the
      character class matches a single
      character.
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