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Regular Expressions explained

Author: Jan Borsodi

Publishing date: 30.10.2000 18:02

Usage

Now you're probably wondering why you should bother to learn regular expressions. Well if you're a normal computer user your benefits from using them are somewhat small, however if you're either a developer or a system administrator you'll find that knowing regular expressions will make your (professional)life so much better.

Developers can use them to parse text files, fix up code and other wonders. System administrators can use them to search trough logs, automate boring tasks and sniff the network traffic for unauthorized activity.

Actually I would go so far as to say it's a crime for a System Administrator not to have any knowledge of regular expressions.

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Comment List

Topic:	Author:	Time:
another great regexp tool	S Church	01.03.2005 16:16
There's a free-as-in-beer development environment for Windows called HTML-Kit that's just great for writing scripts and web code. The Find or Find / Replace functions have a check box for Regexps, with a "Find All" button to highlight every instance matched by a regexp. The only drawback is that it assumes /is (case insensitivity and multiline). VisualREGEXP mentioned in the article says it has no required supporting files, that the standalone executable is all that's needed. However, most Windows machines don't have the TCL/TK component "wish," which the README file claims is necessary for operation. Wish might be available somewhere online as a precompiled binary without having to install all of TCL/TK, but I'm not motivated enough to google it at the moment.
Email match	David Robarts	15.01.2005 22:45
Some valid email addresses will fail this expression (and some invalid addresses pass). [a-z0-9_-]+(.[a-z0-9_-]+)@[a-z0-9_-]+(.[a-z0-9_-]+)+ The underscore character is not allowed in the domain part of the email address and some additional characters are allowed in the username part. This might be better: [a-z0-9_-]+(.[a-z0-9_-+]+)@[a-z0-9-]+(.[a-z0-9-]+)+
can't see the graphic	x x	02.11.2001 01:59
I can't see the graphic towards the bottom to demonstrate the usage of < >