CODEWITHSUNDEEP
regex
aggtr
aggtr

Reputation: 91

regex: Numbers and spaces (10 or 14 numbers)

How I can write a regex which accepts 10 or 14 digits separated by a single space in groups of 1,2 or 3 digits?

examples: 123 45 6 789 1 is valid 1234 567 8 9 1 is not valid (group of 4 digits) 123 45 6 789 109 123 8374 is not valid (not 10 or 14 digits)

EDIT This is what I have tried so far

[0-9 ]{10,14}+

But it validates also 11,12,13 numbers, and doesn't check for group of numbers

Upvotes: 1

Views: 219

Answers (2)

James
James

Reputation: 168

aggtr,

You can match your use case with the following:

^(?:\d\s?){10}$|^(?:\d\s?){14}$

^ means the beginning of the string and $ means the end of the string. (?:...) means a non-capturing group. Thus, the part before the | means a string that starts and has a non-capturing group of a decimal followed by an optional space that has exactly 10 items followed by the end of the string. By putting the | you allow for either 10 or 14 of your pattern.

Edit I missed the part of your requirement to have the digits grouped by 1, 2, or 3 digits.

Upvotes: 0

anubhava
anubhava

Reputation: 785581

You may use this regex with lookahead assertion:

^(?=(?:\d ?){10}(?:(?:\d ?){4})?$)\d{1,3}(?: \d{1,3})+$

RegEx Demo

  • Here (?=...) is lookahead assertion that enforces presence of 10 or 14 digits in input.
  • \d{1,3}(?: \d{1,3})+ matches input with 1 to 3 digits separated by space with no space allowed at start or end.

Upvotes: 2

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