Question 348812 in Javascript Question posted in
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regex validation for only specific characters in Javascript

I am trying to create regular expression for specific code, here are the requirements

  1. Length should be 13
  2. First letter starts with X
  3. Next letters A-Z and 0-9 should accept
  4. Only capital letters

Ex : XAABBCC88EE00

I created this expression ^[X]{1}-[a-zA-Z0-9]{12}$, But it’s not working. How Can I create one for this

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4

Answers


  1. 0

    use ^X[A-Z0-9]{12}$, this would be work for you

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  2. 0 
    ^X[A-Z0-9]{12}$

    Here is what it does:

    • ^ asserts start of a line.
    • X the code should start with the letter "X".
    • [A-Z0-9]{12} ensures that the next 12 characters can be any
      uppercase letter (A-Z) or digit (0-9).
    • $ asserts end of a line.

    This regular expression ensures that the code is exactly 13 characters long, starts with "X", and the remaining 12 characters are either uppercase letters or digits.

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  3. 0

    As per my understanding your thought process for your regex is to define first character length and then other characters length which is not required

    If you use ^X[A-Z0-9]{12}$ it will work, below is the explanation

    ^ Matches the beginning of the string, or the beginning of a line if the multiline flag (m) is enabled. This matches a position, not a character

    X Character matches "X" character (Case sensitive)

    A-Z and 0-9 Matches the exact character A-Z and 0-9 (Case sensitive)

    {12} Quantifier matches 12 digits allowed after X

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  4. 0

    Hello I hope you are doing fine 🙂

    So you have made a mistake in your pattern ^[X]{1}-[a-zA-Z0-9]{12}$

    The mistake:- you wrote [a-zA-Z0-9] this will accept small and capital alphabets plus the numbers.

    The Solution:-
    The required pattern should be /^[X]{1}[A-Z0-9]{12}$/, this will accept the input as per your needs 😉

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