Question 299058 in Javascript Question posted in
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Javascript – Regex to check all occurrences of specific letters be capital

I’m trying to create a regex pattern that follows the rules:

  1. All occurrence of the letters E, I, L must be capital strictly.
  2. All other letters must strictly be lowercase.

I’m working with this rule ^[^eil]*[eil][^eil]*$ but having all capital letters also accepts the string.

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2

Answers


  1. 0

    /^[^eil]*[EIL][^eil]*$/g appears to work on regexr.com using the string: EdIt thE ExprEssIon & tExt to sEE matchEs.L
    Changing E, I or L to lowercase will not match any more, as you are expecting.

    Notably, you must be running the operation in a case sensitive manner. Since you are doing case sensitive operations, you need [EIL] in the regex string to find those uppercase letters.

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  2. 0

    You might use a match for only E I L, lowercase chars a-z without e i l plus digits _ and non word characters W

    ^[EILabcdfghjkm-z0-9_W]+$

    Regex demo

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