May 2009
Intermediate to advanced
510 pages
15h
English
Content preview from Regular Expressions Cookbook
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4.15. Validate Canadian Postal Codes
Problem
You want to check whether a string is a Canadian postal code.
Solution
^(?!.*[DFIOQU])[A-VXY][0-9][A-Z]●[0-9][A-Z][0-9]$| Regex options: None |
| Regex flavors: .NET, Java, JavaScript, PCRE, Perl, Python, Ruby |
Discussion
The negative lookahead at the beginning of this regular
expression prevents D, F, I, O, Q, or U anywhere in the subject
string. The ‹[A-VXY]›
character class further prevents W or Z as the first character. Aside
from those two exceptions, Canadian postal codes simply use an
alternating sequence of six alphanumeric characters with a space in
the middle. For example, the regex will match K1A 0B1, which is the
postal code for Canada Post’s Ottawa headquarters.
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