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Regular Expressions

.	anything (except a \n)
\d	a digit (0-9, same as [0-9])
\w	a word character (a-z, A-Z, 0-9, _, [a-zA-Z0-9_])
\s	a space character (space, tab, linefeed, carriage return, [ \t\n\f\r])
\D	not a digit (opposite of \d)
\W	not a word character (opposite of \w)
\S	not a space character (opposite of \s)

^	anchors to the beginning of the string
$	anchors to the end of the string
\b	word boundary (between \w and \W or \w and beginning/end of a line)

/i	Ignore case
/g	global -- match/substitute as often as possible

You can use parentheses to capture a matched piece of text for later use.

To recall the captured matched text:

Use an m (optional) for matching, and an s for substitution.

$string = "Perl is cool";

$string =~ m/cool/
Returns: True (1)

$string =~ s/cool/chilly/;
Returns: Perl is chilly