July 2007
Intermediate to advanced
128 pages
2h 39m
English
Content preview from Regular Expression Pocket Reference, 2nd EditionEmail
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Recipes
Removing leading and trailing whitespace
s/^\s+// s/\s+$//
Matches: " foo bar “, "foo "
Nonmatches: "foo bar"
Numbers from 0 to 999999
/^\d{1,6}$/Matches: 42, 678234
Nonmatches: 10,000
Valid HTML Hex code
/^#([a-fA-F0-9]){3}(([a-fA-F0-9]){3})?$/Matches: #fff, #1a1, #996633
Nonmatches: #ff, FFFFFF
U.S. Social Security number
/^\d{3}-\d{2}-\d{4}$/Matches: 078-05-1120
Nonmatches: 078051120, 1234-12-12
U.S. zip code
/^\d{5}(-\d{4})?$/Matches: 94941-3232, 10024
Nonmatches: 949413232
U.S. currency
/^\$\(d{1,3}(\,\d{3})*|\d+)(\.\d{2})?$/Matches: $20, $15,000.01
Nonmatches: $1.001, $.99
Match date: MM/DD/YYYY HH:MM:SS
/^\d\d\/\d\d\/\d\d\d\d \d\d:\d\d:\d\d$/
Matches: 04/30/1978 20:45:38
Nonmatches: 4/30/1978 20:45:38, 4/30/78
Leading pathname
/^.*\//
Matches: /usr/local/bin/apachectl
Nonmatches: C:\\System\foo.exe
(See MRE 190–192.)
Dotted Quad IP address
/^(\d|[01]?\d\d|2[0-4]\d|25[0-5])\.(\d|[01]?\d\d|2[0-4]\d|25[0-5])\. (\d|[01]?\d\d|2[0-4]\d|25[0-5])\.(\d|[01]?\d\d|2[0-4]\d|25[0-5])$/
Matches: 127.0.0.1, 224.22.5.110
Nonmatches: 127.1
(See MRE 187–189.)
MAC address
/^([0-9a-fA-F]{2}:){5}[0-9a-fA-F]{2}$/Matches: 01:23:45:67:89:ab
Nonmatches: 01:23:45, 0123456789ab
/^[0-9a-zA-Z]([-.\w]*[0-9a-zA-Z_+])*@([0-9a-zA-Z][-\w]*
[0-9a-zA-Z]\.)+[a-zA-Z]{2,9}$/Matches: tony@example.com, tony@i-e.com, tony@mail.example.museum
Nonmatches: .@example.com, tony@i-.com, tony@example.a
(See MRE 70.)
HTTP URL
/(https?):\/\/([0-9a-zA-Z][-\w]*[0-9a-zA-Z]\.)+[a-zA-Z]{2,9})
(:\d{1,4})?([-\w\/#~:.?+=&%@~]*)/Matches: https://example.com ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.