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RegexSearch is a Java application that performs graphical find and find-and-replace searches for regular expressions on multiple text files. It is distributed under version 3 of the GNU General Public License.

Features:

It can search for literal text or regular expressions.
The search can be performed on a single file, on a directory (with optional recursion), on the files and directories listed in a text file, or on the files in which the target was found in a previous search. Files can be included in and excluded from the search by means of pathname filters, which allow bounded recursion.
Occurrences of the target expression within each file are displayed in a scrollable window, with the matched text highlighted.
Occurrences of the target expression can be replaced individually or globally. If the target is a regular expression, the replacement can include arbitrary parts of the matched text.
Replacements can be previewed, then accepted or rejected.
The parsing and matching of regular expressions is performed by the robust Java regular-expression engine. The syntax of Java's regular expressions is similar to that of Perl and Python.
The results of a search (number of matches, number of replacements) are displayed for each file in which a match is found. The results can be copied to the system clipboard in a form that is suitable for use as a list file to limit the scope of a new search.
Although a file cannot be edited in RegexSearch's text view, a command can be issued to open the file in an external editor.