java - Overlapping regular expression -

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I got a similar question though I did not find the job:

I like "my_token_string" There is a string and a regex is needed to return the token "my_", "_token_", and "_string".

Please note that I can not change the Java code as it is part of any other software. The only thing I can do is to capture patterns and groups: -)

This is what I have done: 

  string p = " (? = (_ [^ _] * _))? "; Int group = 1; String test = "my_token_string"; Matcher m = Pattern.compile (p). Mishor (test); While (m.find ()) {System.out.println (m.group (group)); }   
 But of course it only gives "_token_" and "_string" token.   
 
 
 you  "(? = ((| | | _).? (_ | $) ). Try using " as the group number  1 .  
 This will start with  _  or input ( Will start the token with  ^ ) and end it with  _  or end up with input ( $ )  instead of < Code> [^ _] + , but I like this version.

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