Regex for 10 or 6 digit number should not start and end with '/' and can also be a single word in a string

Question

Need regex for 6 or 10 digit number can be start and end with space, can also be a single word in a whole string. It should not start and end with '/'.

For example:

My Zip-code is 101010. Please update. -> 101010
9090909090 is my mobile number -> 9090909090
00/9090909090/000000/ -> should not find any number
9090909090 -> 9090909090

I have tried this

\b(\d{11}|\d{10}|\d{6})\b

regex, but unable to handle 3rd situation.

`\b` is not really matching the condition of "not starting or ending with `/`" as it matches zero-length characters (word boundaries) — thinkgruen, Jun 12 '21 at 04:32
@thinkgruen do you have any suggestion for the above problem statement — Durgesh Sharma, Jun 12 '21 at 04:37
Yep https://stackoverflow.com/questions/9306202/regex-for-matching-something-if-it-is-not-preceded-by-something-else. Additionally, you need a look-behind as well — thinkgruen, Jun 12 '21 at 04:47
No, it is not helpful in this case, as it does not answer the current question. — Wiktor Stribiżew, Jun 14 '21 at 09:05

score 1 · Accepted Answer · answered Jun 12 '21 at 19:31

You can use

\b\d{6}(?:\d{4})?\b(?!\/)

See the regex demo and the regex graph:

Details:

\b - a word boundary
\d{6} - any six digits
(?:\d{4})? - an optional sequence of four digits
\b - a word boundary
(?!\/) - there must be no / immediately to the right of the current location (this is a negative lookahead).

Regex for 10 or 6 digit number should not start and end with '/' and can also be a single word in a string

1 Answers1