Regular Expressions 101

Pro

Negative Lookahead(?!(?:\D*\d){14}$|(?:\D*\d){1,3}$)

1st Alternative(?:\D*\d){14}$

Non-Capturing Group(?:\D*\d){14}

{14}repeats the group contents below exactly 14 times:

\D*any character that's not a digit, repeated any number of times

\da digit

$end of line

2nd Alternative(?:\D*\d){1,3}$

Non-Capturing Group(?:\D*\d){1,3}

{1,3}repeats the group contents below between 1 and 3 times:

\D*any character that's not a digit, repeated any number of times

\da digit

$end of line

\da digit

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

26 tokens

(?!(?:\D*\d){14}$|(?:\D*\d){1,3}$)\d

New

71088-987876-54-351
7108898787654351
7108-8987-8765-4351
7-108-8--9-87-8--7-6-5-43-5-1

*

71088-987876-54-351
7108898787654351
7108-8987-8765-4351
7-108-8--9-87-8--7-6-5-43-5-1