Many languages, including Perl, PHP, Python, JavaScript, and JScript, now support regular expressions for text processing, and some text editors use regular expressions for powerful search-and ...

If you work with text, you owe it to yourself to learn regular expressions, and Patterns can help you do that--as well as figure out exactly what your search patterns are capturing.

That's different from ls read*.txt, which will match both readme.txt and read.txt, because the asterisk means "zero or more characters" in the file glob. Here's the easy way to remember if you're ...