EasyPattern Helper 

Design patterns using point and click! Just highlight the variable text and the text to capture, and EPHelper does the rest! EasyPatterns are a cool new way to describe text patterns. They're English-like, powerful and easy to understand.
ezpattern ezpatterns easypatterns easypattern perl grep egrep pattern easy pattern easy patterns ez pattern ez patterns.regex regexp regular expression

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, ...
grep egrep regular expressions perl regex regular expression regexes search and replace search replace desktop network logs log files

RegexBuddy 

Perfect companion for working with regular expressions. Easily create and clearly understand regex patterns. Test any regex on sample strings and files. Use the regex with automatic source code snippets. Collect regex libraries for future use.
regex regexp regular expression regular expressions grep search pattern replace split egrep pcre perl delphi java