如何在C＃正则表达式中找到字符串中所有附近的单词？

Question

Regex.Matches("word1 word1 word1", @"\bword1\W+(?:\w+\W+){0,1}?word1\b");

this Regex return only one occurrence "word1 word1"

What i need to add to this Regex to get all occurrences as below (may be some recursive pattern)?

1. "word1 word1"
2. "word1 word1"
3. "word1 word1 word1"

Sorry my (confusing) example is not a question about repeated words. To be more clear i give a second example : "xxx_w1 aa yyy_w1 zzz_w1". I want to get the words ending by "_w1" separated by space ore one word (some distance) and the result for my example should be :

1. xxx_w1 aa yyy_w1
2. yyy_w1 zzz_w1

The issue with my Regex above is that i get only the first match instead of the two maches above.

Answer 1

To find repeated words in a text, try this pattern:

\b(\w+)\b(?:\s*\1)+

And here it is in action: