Perl free example : Regular expressions, using wildcards? tutorial sample code

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Regular expressions, using wildcards?

(Perl free example written by Anton Zamov.)

Regular expressions, using wildcards?

. Match any character
w Match "word" character (alphanumeric plus "_")
W Match non-word character
s Match whitespace character
S Match non-whitespace character
d Match digit character
D Match non-digit character
t Match tab
n Match newline
r Match return
f Match formfeed
a Match alarm (bell, beep, etc)
e Match escape
021 Match octal char ( in this case 21 octal)
xf0 Match hex char ( in this case f0 hexidecimal)
You can follow any character, wildcard, or series of characters and/or wildcard with a repetiton. Here's where you start getting some power:
* Match 0 or more times
+ Match 1 or more times
? Match 1 or 0 times
{n} Match exactly n times
{n,} Match at least n times
{n,m} Match at least n but not more than m times
Now for some examples:
$string =~ m/s*rem/i; #true if the first printable text is rem or REM
$string =~ m/^S{1,8}.S{0,3}/; # check for DOS 8.3 filename
# (note a few illegals can sneak thru)

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