Software to "search code string"

Hi, for the last 12 hours Im trying to remember and locate a certain software (that I've used once, but dont remember the name) that I can use to search for a certain code string on a bunch of files and replace that string.
I've used it once, but my memory is not helping, does anyone know this software?

Thanks buddys.

 

visual studio will do it

 

visual studio will do it but it isn't natively supported

 

see here

java.pakcarid.com/default.aspx?sub=25&Sls=25

 

Well there is a cool program called locate32. You could search a string from a bunch of files but I don't know if whether it will replace it or not.