RegexBuddy
RegexBuddy is your perfect companion for working with regular expressions. Easily create regular expressions that match exactly what you want. Clearly understand complex regexes written by others. Use plain English building blocks instead of or in addition to the standard regex syntax. ... Learn all there is to know about regular expressions from RegexBuddy's comprehensive documentation and detailed regular expression tutorial. ... Quickly test any regular expression on sample strings and files, preventing mistakes on actual data.
http://www.regexbuddy.com/cgi-bin/SetupRegexBuddyDemo.exe - 3Mb - Download - Screenshot

PrEditor
A syntax colouring programmer's editor for program languages, scripts, HTML, configuration files, documentation, and text files. With an FTP client and transparent support for DOS, UNIX, and Mac files, PrEditor allows you edit any file, anywhere. It has pre-defined syntax colouring for most... Macro record / playback helps to automate repetitive tasks, advanced formatting tools, plus regular expression find and replace give you complete control over the text you are editing. ... The comprehensive HTML help provides detailed guidance on how to use PrEditor to its full potential - editing in...
http://www.thistlesoft.com/downloads/pred21.exe - 2Mb - Download - Screenshot

PatternHelper
Makes it easy for developers AND beginners to design and test patterns. Patterns written with perl regular expressions, egrep regex, MS Word or Brief pattern matching languages can be designed and tested with syntax highlighting and a slick test facility. ... Default patterns can also be chosen from a list. ... PatternHelper can run stand-alone, and also integrates with TextPipe Pro and a host of other applications.
http://www.datamystic.com/patternhelper.exe - 1Mb - Download - Screenshot

Compare It!
Powerful file compare and merge utility. Features: build-in editor with syntax highlighting, undo and wordwrap; highlights changes within lines; editing or fast by-difference merging; printing; html and text reports; zip support; Unicode support; search and replace with regular expressions;...
http://www.grigsoft.com/wc3setup.zip - 0b - Download - Screenshot

httpExplorer
Used to examine unaltered http requests and responses intercepted with and without proxy. There are several views for the data. Raw view shows the data in bytes. Text view shows the headers in the request and response as well as the http payload. The list of requests and responses are also... It is possible to search through the request urls to look for a particular url using regular expression syntax. ... The other view shows the actual sends and receives performed by the browser. ... httpExplorer works by intercepting the client/server data stream of the embeded browser.
http://overture-computing.com/httpExplorer/files/httpExpInstall.exe - 1Mb - Download - Screenshot

ECMerge Standard (Linux)
ECMerge compares and merges files and folders, side-by-side. It is designed for software engineers, web authors and other professionals who work with multiple revisions of text files or who need to keep multiple folder hierarchies in sync. Save your work at intermediate situation and restart it... Ignore lines matching a regular expression. ... Filter files/folders to be displayed in Folder comparison view, by name (regular expressions), or by status. ... ECMerge provides syntax colouring for C/C++, Java, HTML, ASP, PHP and many others.
http://www.elliecomputing.com/soft/ecmerge-1.1.27.linux.x86.tgz - 4Mb - Download - Screenshot

ECMerge Standard (Windows)
ECMerge compares and merges files and folders, side-by-side. It is designed for software engineers, web authors and other professionals who work with multiple revisions of text files or who need to keep multiple folder hierarchies in sync. Save your work at intermediate situation and restart it... Ignore lines matching a regular expression. ... Filter files/folders to be displayed in Folder comparison view, by name (regular expressions), or by status. ... ECMerge provides syntax colouring for C/C++, Java, HTML, ASP, PHP and many others.
http://www.elliecomputing.com/soft/ecmerge-1.1.27.win32.exe - 3Mb - Download - Screenshot

MetaProducts Web Studio
This is a universal project-oriented tool for developing and supporting Web sites. It includes a powerful text editor that provides flexible development tools for working with HTML, XHTML, JavaScript, CSS, Perl and other Web technologies. It provides customizable syntax highlighting and the... A built-in browser and FTP client and find-and-replace with regular expression support through multiple files are also included. ... A number of wizards provide flexible tag insertion for the most complex HTML tags and it also includes a built-in style builder.
http://dl.filekicker.com/send/file/167662-N8IL/wssetup.exe - 4Mb - Download - Screenshot

ECMerge Pro (Linux)
ECMerge compares and merges files and folders, side-by-side or 3-way. It is designed for software engineers, web authors and other professionals who work with multiple revisions of text files or who need to keep multiple folder hierarchies in sync. Two text files or folders can be compared to a... Ignore lines matching a regular expression. ... Filter files/folders to be displayed in Folder comparison view, by name (regular expressions), or by status. ... ECMerge provides syntax colouring for C/C++, Java, HTML, ASP, PHP and many others.
http://www.elliecomputing.com/soft/ecmerge-1.1.27.linux.x86.tgz - 4Mb - Download - Screenshot

ECMerge Pro (Windows)
ECMerge compares and merges files and folders, side-by-side or 3-way. It is designed for software engineers, web authors and other professionals who work with multiple revisions of text files or who need to keep multiple folder hierarchies in sync. Two text files or folders can be compared to a... Ignore lines matching a regular expression. ... Filter files/folders to be displayed in Folder comparison view, by name (regular expressions), or by status. ... ECMerge provides syntax colouring for C/C++, Java, HTML, ASP, PHP and many others.
http://www.elliecomputing.com/soft/ecmerge-1.1.27.win32.exe - 3Mb - Download - Screenshot