Strange Regex Capture Group behavior returning "or" pipes into result

Question

I am trying to make a capture group to find/replace suffixes.

Please see the example here:

https://www.myregextester.com/?r=b23e74dc

and my summary below:

Regex:

(\b(.*?)(logical|logic))

Requested Ouput:

• 0=\0
• 1=\1
• 2=\2

however the output of the capture groups I test return the "|" into the result with it seems some redundancy

Output:

• 0=Meteorologic
• 1=Meteorologic
• 2=Meteoro0=|Meteorological
• 1=|Meteorological
• 2=|Meteoro

Clearly I have introduced some error into the regex since I do NOT want the "|" in the output but I am unclear what it could be.

Answer 1

你应该把它放好，这样你才能看到它。

Meteorologic|Meteorological


0=Meteorologic
1=Meteorologic
2=Meteoro
0=|Meteorological
1=|Meteorological
2=|Meteoro

第一场比赛结束Meteorologic |气象

第二场比赛开始Meteorologic |Meteorological

在c和|之间是单词边界，因此\b得到满足。

然后.*?（捕获组2）将|Meteoro与逻辑匹配。

然后在捕获组3中logical。

所以，它可以满足您的要求。

修复

要偏向单词边界以找到右边的单词，只需引入一个单词 像这样(\b(?=\w)(.*?)(logical|logic))

的前瞻

关于单词边界的说明：它们是灵巧的。

相当于

 (?:
      (?:
           ^ 
        |  (?<= [^a-zA-Z0-9_] )
      )
      (?= [a-zA-Z0-9_] )
   |  
      (?<= [a-zA-Z0-9_] )
      (?:
           $ 
        |  (?= [^a-zA-Z0-9_] )
      )
 )

希望这有帮助。

Answer 2

You can use negated pattern [^|]* to match anything but pipe:

(\b([^|]*)(logic(?:al)?))

Alternatively you can use \w as well:

(\b(\w*)(logic(?:al)?))

RegEx Demo