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Grep is a command line utility that searches files for lines that match a regular expression.
How regular expressions can be useful in OSINT. Theory and some practice using Google Sheets
The first version of this utility appeared almost 50 years ago, in 1973. But it is still actively used and maintained (the last version was released in August 2021! https://ftp.gnu.org/gnu/grep/).
This repository contains various modifications of grep, as well as analogues of this utility for a wide variety of search tasks.
To get the most out of the grep utilities mentioned above, use them along with sed and awk (and add some Perl in particularly difficult cases).
You can read more about all this here:
Command line text processing manual https://github.com/learnbyexample/Command-line-text-processing
Examples of regular expressions for extracting various data from texts can be found in the repository:
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