regexxer - regexxer is a nifty GUI search/replace tool featuring Perl-style regular expressions.
TextCrawler - Find and replace across multiple files
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, ...
dnGREP - dnGrep allows you to search across files with easy-to-read results.
grepWin - grepWin is a simple search and replace tool which can use PCRE regular expressions to search for...
Search & Replace Master - Search & replace the text in your files in seconds.