Utilizing Regex to Authenticate a CAGE Code

Our task is to create a RegEx pattern that can accurately validate a CAGE Code

A CAGE Code consists of five (5) positions. The code must adhere to the following format:

  • The first and fifth positions must be numeric.
  • The second, third, and fourth positions can be any combination of alpha/numeric characters except for letters I and O.
  • Case sensitivity is not a factor

We attempted to use the RegEx pattern

cageCode = new RegEx(/^[a-zA-Z0-9]{5}$/)
but it does not satisfy the specified requirements.

What might be the appropriate RegEx pattern to successfully validate the given criteria?

Answer №1

In order to find a specific pattern of 5 characters that could be either numbers or letters, consider using the following regular expression:

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

This breakdown explains each part:

  1. ^\d: Checks if the string starts with a digit
  2. (?:(?![ioIO])[A-Za-z\d]){3}: Ensures there are 3 alphanumeric characters excluding i/o/I/O
  3. \d$: Validates that the string ends with a number

Answer №2

To meet the specified criteria, a simple regular expression can be used:

^\d[A-HJ-NP-Za-hj-np-z\d]{3}\d$

Here is an explanation of the regex pattern:

^        Denotes the beginning of the string
\d       Represents a single digit
[A-HJ-NP-Za-hj-np-z\d]
         Specifies a character set including A to H, J to N, and P to Z in uppercase,
         as well as the same letters in lowercase, along with digits. Letters I, i O, and o are excluded.
{3}      Indicates that there should be three instances of the characters within the brackets
\d       Confirms the presence of a final digit
$        Signifies the end of the string

Answer №3

^(?![IO])[0-9A-HJK-NP-Z]{5}$

Feel free to use helpful tools for verification

Answer №4

Below is a collection of RegEx patterns that can be used to meet the specified criteria:

function validateCageCode(input: string) {
    const cageCodeRegEx = new RegExp(/^[0-9][A-HJ-NP-Z\d][A-HJ-NP-Z\d][A-HJ-NP-Z\d][0-9]$/i);
    // const cageCodeRegEx = new RegExp(/^[0-9][A-HJ-NP-Za-hj-np-z0-9]{3}[0-9]$/i);
    // const cageCodeRegEx = new RegExp(/^\d(?:(?![ioIO])[A-Za-z\d]){3}\d$/i); 
    // const cageCodeRegEx = new RegExp(/^\d[A-HJ-NP-Za-hj-np-z\d]{3}\d$/i); 
    return cageCodeRegEx.test(input);
}

// Usage samples:
console.log(validateCageCode("1ABC2")); // true
console.log(validateCageCode("1A0B2")); // true
console.log(validateCageCode("1AIB2")); // false (contains 'I')
console.log(validateCageCode("1AOB2")); // false (contains 'O')
console.log(validateCageCode("A1234")); // false (first character is not a digit)
console.log(validateCageCode("12345")); // true
console.log(validateCageCode("1def2")); // true
console.log(validateCageCode("1d0e2")); // true
console.log(validateCageCode("1eid2")); // false (contains 'i')
console.log(validateCageCode("1dob2")); // false (contains 'o')
console.log(validateCageCode("x1234")); // false (first character is not a digit)
console.log(validateCageCode("12345")); // true

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