Perl free example : Perl regular expressions character classes tutorial sample code

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Perl regular expressions character classes

(Perl free example written by Anton Zamov.)

Perl regular expressions character classes

d A digit, same as [0-9]
D A nondigit, same as [^0-9]
w A word character (alphanumeric), same as [a-zA-Z_0-9]
W A nonword character, [^a-zA-Z_0-9]
s A whitespace character, same as [tnrf]
S A non-whitespace character, [^tnrf]
^ Matches at the beginning of the string (or line, if /m used)
$ Matches at the end of the string (or line, if /m used)
b Matches at word boundary (between w and W)
B Matches except at word boundary
A Matches at the beginning of the string
Z Matches at the end of the string or before a newline
z Matches only at the end of the string
G Matches where previous m//g left off

Maximal Minimal Allowed Range
{n,m} {n,m}? Must occur at least n times but no more than m times

{n,} {n,}? Must occur at least n times

{n} {n}? Must match exactly n times

* *? 0 or more times (same as {0,})

+ +? 1 or more times (same as {1,})

? ?? 0 or 1 time (same as {0,1})

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