![]() You may export data from one program as a text file then modify its layout so you may import it into another program using a text editor. You may wish to process certain files in a directory, but only if they meet particular conditions, in work you are doing on the command line. You may want to check that a password meets certain criteria such as, a mix of uppercase and lowercase, digits and punctuation etc in a program you are writing. You may wish to clean up some poorly formatted HTML by replacing all uppercase tags with lowercase equivalents in a text editor. You may wish to identify all email addresses in some content using a text editor. Search for particular items within a large body of text.That's kinda a bit abstract so let's try to put it into perspective. A regular expression is a means for describing a particular pattern of characters of text. The following pages are intended to give you a solid foundation in how to write regular expressions (Also referred to as regex or RE's). ![]()
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