Agree with Sioln's answer, and would like to make it more "relational":

I would make 3 tables :
FILE (Contains ID and File Name, and possibly # of lines, or some indicator of size);
REGEX (Contains an ID, the Regex)
OCCURRANCE (Contains Regex_ID, FIle_ID, Line number).

You can pick a regex from the REGEX table, and find all occurrances from the OCCURRANCE table.

Obviously, run a batch process to populate the tables.

Consider SQLite, if you want a fast, very lightweight,free database.

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In reply to Re: Searching local files by NetWallah
in thread Searching local files by tomazos

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