dnGREP - dnGrep allows you to search across files with easy-to-read results.
RegEx Lab - RegEx Lab allows you to test regular expressions.
grepWin - grepWin is a simple search and replace tool which can use PCRE regular expressions to search for...
Multi String Replacer - Replace multiple strings at once!
PowerGREP - Quickly search through large numbers of files on your PC or network using powerful text patterns to find exactly the information you want. Search and replace with plain text or regular expressions to maintain web sites, source code, reports, ...
FileSeek - FileSeek is an easy-to-use file search app that includes advanced functionality for power users!