CODEWITHSUNDEEP
regexvb.net
Wotikar
Wotikar

Reputation: 47

RegEx VB.NET part of string

I have a regex witch searches for dates (0[1-9]|[12][0-9]|3[01])[- /.](0[1-9]|1[012])[- /.](20)\d\d.

The problem is that it also returns matches where the match is within another string like 10.10.10.2019 it matches 10.10.2019 as a date. Tried with \b at the beginning and end but no luck. Also used ^ and $ but still no luck.

Upvotes: 0

Views: 97

Answers (1)

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 626689

You need to use lookarounds to only match in between whitespaces or start/end of string:

(?<!\S)(?:0?[1-9]|[12][0-9]|3[01])([- /.])(?:0?[1-9]|1[012])\k<1>20\d\d(?!\S)
^^^^^^^                                                                ^^^^^^

See the regex demo

I also suggest to check for the identical separators by capturing the first separator with ([- /.]) and then using \k<1> (unambiguous) backreference to match the same value.

Upvotes: 1

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