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[xkcd] Regular Expressions (10 Jan 2007)
(programming.dev)
Hover Text:
Wait, forgot to escape a space. Wheeeeee[taptaptap]eeeeee!
Transcript
[in a yellow box:]
Whenever I learn a new skill I concoct elaborate fantasy scenarios where it lets me save the day.Megan: Oh no! The killer must have followed her on vacation!
[Megan points to computer.]
Megan: But to find them we'd have to search through 200 MB of emails looking for something formatted like an address!
Cueball: It's hopeless!Off-panel voice: Everybody stand back.
Off-panel voice: I know regular expressions.
[A man swings in on a rope, toward the computer.]
tap tap
The word PERL! appears in a bubble.[The man swings away, and the other characters cheer.]
Learning basic regex takes less than a day. Learning extended regex takes a day or two.
If you're often writing Python scripts to scan strings and match patterns, I can almost guarantee you're actually wasting more of your time avoiding having to use regex.
In fact, if you're working with large datasets, you're wasting even more time waiting for your scripts to finish. Python's regular expression engine is written in C, which is considerably faster than plain Python.