{ 2008 04 23 }

Everybody Loves Regular Expressions!

I’ve had several requests for my “Regular Expressions Quick-Reference/Comparison Chart,” so I’m posting it here. At the moment, it covers the vim-, BRE- (used by ed, sed, and grep), ERE- (used by egrep, and sed -r), and perl- (used by perl (naturally!) and most copies of rename) flavors at the moment. This is still quite a work in progress—I’m considering adding another column (perhaps ruby?), and I’m sure there are at least one or two typos that I’ve let slip through. Please tell me if you find any errors at all, either through comment here or by email.

Regular Expressions Quick-Reference/Comparison Chart (150dpi PNG)
(The requisite preview thumbnail—click to see the 150dpi PNG version.)

After the jump, I’ve attached PDF, postscript, and closely-cropped PNG (150- and 300dpi) versions. I’ve also included my LaTeX source file. Enjoy!

The first release is current, last revised on 2008-04-23. (I will update this line as versions are released.)

My “Regular Expressions Quick-Reference/Comparison Chart,” available under the Creative Commons Attribution-Share Alike 3.0 Licence, comes in the following flavors:

Currently known errors/omissions:

  • From scrooloose (in #vim on irc.freenode.net): “vim has negative lookahead” and possibly other “look” operations. (Note: Check out :h \@! for more info.)

Revisions:

  • 2008-04-23: First public release.

Posted by Clay Barnes on Wednesday, April 23rd, 2008, at 3:40 pm, and filed under regex, regular expressions, source code.

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