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Javascript – Regular Expression to validate a CAGE Code

We need to write a RegEx which can validate a CAGE Code

A CAGE Code is a five (5) position code. The format of the code is

  • the first and fifth position must be numeric.
  • The second, third and fourth may be any mixture of alpha/numeric excluding alpha letters I and O.

We came up with a RegEx cageCode = new RegEx(/^[a-zA-Z0-9]{5}$/) which is not properly validating the requirements given.

What could be the possible regEx which could validate the requirements mentioned?

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2

Answers


  1. 0

    You’re trying to match 5 characters which could be either numbers or letters. Try something like this:

    ^d(?:(?![ioIO])[A-Za-zd]){3}d$

    To break it down:

    1. ^d: Will check if the string starts with a number
    2. (?:(?![ioIO])[A-Za-zd]){3}: To check if there are 3 alphanumeric characters except i/o/I/O
    3. d$: To validate if the string ends with a number
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  2. 0

    A simple regex to achive the requirement is:

    ^d[A-HJ-NP-Za-h-j-np-zd]{3}d$

    This is explained as:

    ^        Start of string
d       A digit
[A-HJ-NP-Za-hj-np-zd]
         A character clas comprising A to H, or J to N, or P to Z,
         plus the same in lower case, plus digits. This thus omits the  I, i O and o.
{3}      Three of the above characters
d       A final digit
$        End of string
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