Your reg exp is saying match everything where there is everything except for an a one or zero times before the sin.

How can i changed it, on the this site http://gskinner.com/RegExr/ all worked ok, why it is hapanned?

You should have “ayes!” based on this regexp. Are you sure you have “yes!” only?

Sorry, but i do not fully understand what you said, this is full code whitch i used

Ruzik wrote:

How can i changed it, on the this site http://gskinner.com/RegExr/ all worked ok, why it is hapanned?

No it didn’t [regexr.com]
Just remove the {0,1} to make it work. However this will also select the character before the sin(. May I suggest something like \bsin\( or usage of subexpressions.

Ok, thank you for help!