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Special characters: [ ] ( ) { } - + * . ^ $ ? | \
Pattern-Matching Operators:⁄orelly⁄perl2⁄prog⁄ch05_02.htm
Regular expressions:⁄codecorn⁄littperl⁄perlreg.htm⁄Unix⁄regex.php
s⁄⁄⁄ modifiers:
⁄i          Ignore alphabetic case (when matching).
⁄m           Let ^ and $ match next to embedded \n. ^ for beginning, and $ for the end of the line. . matches everything except newline.
⁄s           Let . match newline and ignore deprecated $*.
⁄x          Ignore (most) whitespace and permit comments in pattern.
⁄o          Compile pattern once only.
⁄g          Replace globally, that is, all occurrences.
⁄e          Evaluate the right side as an expression.
Wildcards and Repetitions:
.          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)
*          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
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