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PERL

Practical Extraction and Reporting Language. It is a string processing scripting language.

Resources
Perl books UK
  		Perl books USA
 

Perl's Regular Expressions

Code
 		 Description
. any character
\t tab
\n new line
\r return
\f formfeed
\a alarm (bell, beep etc)
\e escape
\O octal character e.g. \O25 for octal 25
\x hex character e.g. \xf4 for hexidecimal f4

 
Code
 		 Actual Description
\d [0-9] any digit
\w [a-zA-Z_0-9] any alphanumeric character
\s [\t\n\r\f] any whitespace character
\D [^0-9] any nondigit
\W [^a-zA-Z_0-9] any nonalphanumeric character
\S [^\t\n\r\f] any nonwhitespace character

 

Symbols
Symbol
 		 Explanation Example
=~ Compare string with a regular expression.
!~ Negated form of =~
/ Delimiter
m Match operator. if ($browser =~ m/MSIE/) {....
[....] a class of characters between the square brackets.
^ Beginning of line symbol.
[^....] At the start of a class means NOT.
$ End of line symbol.
i Case insensitiviy.
\b At start or end of word, according to its position. matches free-standing word: /\bword\b/
\B Not at start or end of word, according to its position.
\g At end of pattern to save all matches. =~ m/pattern/g

Links
CPAN - Comprehensive Perl Archive Network
 
 

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(c) Created by B V Wood.
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