What are some alternatives?
When comparing grepWin and regexxer, you can also consider the following products
AstroGrep - AstroGrep is A Microsoft Windows GUI File Searching (grep) utility.
grep - grep is a command-line utility for searching plain-text data sets for lines matching a regular...
dnGREP - dnGrep allows you to search across files with easy-to-read results.
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, ...
Agent Ransack - Agent Ransack is a tool for finding files and information on your hard drive fast and efficiently.
Multi String Replacer - Replace multiple strings at once!