RegEx to match only {n} digits and not much or less surrounded by whatever

Question

I'm trying to match only {n} digits not more or less and may be surrounded by characters or special symbols

example:
suppose the {n} = {14}

*12345678901234*300 OK

12345678901234x21 OK

*123456789012345*300 NOT OK

12345678901234 OK

123456789012345 NOT OK

I don't understand the close votes... this question seems reasonably clear and well-defined. — kevinji, Mar 23 '19 at 23:58

Ashkan Mobayen Khiabani · Answer 1 · 2019-03-23T22:58:09.183

1

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

Here is a Live Demo

edited Mar 23 '19 at 22:58

answered Mar 23 '19 at 22:50

score 1 · Accepted Answer · answered Mar 24 '19 at 09:47

1

You could use negative lookarounds to assert what is directly on the left and right is not a digit and match 14 digits:

(?<!\d)\d{14}(?!\d)

answered Mar 24 '19 at 09:47

The fourth bird

2 Answers2