Regex Matches in the Middle of Repeated Matches

Asked Jul 09 '17 at 12:42

Active Jul 09 '17 at 12:42

Viewed 21 times

Let me explain this case since I tried to search this online already but I couldn't find the same case with this.

I have this binary number:

1011010110110

I am trying to find matches using this number:

Using this code:

Regex.Matches(result, "101").Count

This would return 3. But if you will look closely, the right answer should be 4.

Since there are 4 times you can find 101 on 1011010110110:

(101)1010110110
101(101)0110110
10110(101)10110
10110101(101)10

How should I write my Regex so that this will return 4 results or any approach you can advise me to achieve what I am trying to do.

asked Jul 09 '17 at 12:42

Willy David Jr

1

`Regex.Matches(s, "(?=101)")` – Wiktor Stribiżew Jul 09 '17 at 12:45
might be duplicate of https://stackoverflow.com/questions/320448/overlapping-matches-in-regex – Phuong Nguyen Jul 09 '17 at 12:46
Perfect @WiktorStribiżew. What does ?= means by the way? – Willy David Jr Jul 09 '17 at 12:47
`(?=...)` is a positive lookahead. – Wiktor Stribiżew Jul 09 '17 at 12:49
Thanks again, if I can just accept your answer. I really appreciate it! @WiktorStribiżew – Willy David Jr Jul 09 '17 at 12:49
Yeah, you need not accept it, just upvote [my other answer](https://stackoverflow.com/a/41989091/3832970) since it turned out helpful for you. – Wiktor Stribiżew Jul 09 '17 at 12:53
@WiktorStribiżew Done! Thanks again! :) – Willy David Jr Jul 10 '17 at 01:25

0 Answers0