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CentOS 7.0 - man page for html::entities (centos section 3)

HTML::Entities(3)	       User Contributed Perl Documentation		HTML::Entities(3)

NAME
       HTML::Entities - Encode or decode strings with HTML entities

SYNOPSIS
	use HTML::Entities;

	$a = "Våre norske tegn bør &#230res";
	decode_entities($a);
	encode_entities($a, "\200-\377");

       For example, this:

	$input = "vis-a-vis Beyonce's naieve\npapier-mache resume";
	print encode_entities($input), "\n"

       Prints this out:

	vis-à-vis Beyoncé's naïve
	papier-mâché résumé

DESCRIPTION
       This module deals with encoding and decoding of strings with HTML character entities.  The
       module provides the following functions:

       decode_entities( $string, ... )
	   This routine replaces HTML entities found in the $string with the corresponding
	   Unicode character.  Unrecognized entities are left alone.

	   If multiple strings are provided as argument they are each decoded separately and the
	   same number of strings are returned.

	   If called in void context the arguments are decoded in-place.

	   This routine is exported by default.

       _decode_entities( $string, \%entity2char )
       _decode_entities( $string, \%entity2char, $expand_prefix )
	   This will in-place replace HTML entities in $string.  The %entity2char hash must be
	   provided.  Named entities not found in the %entity2char hash are left alone.  Numeric
	   entities are expanded unless their value overflow.

	   The keys in %entity2char are the entity names to be expanded and their values are what
	   they should expand into.  The values do not have to be single character strings.  If a
	   key has ";" as suffix, then occurrences in $string are only expanded if properly
	   terminated with ";".  Entities without ";" will be expanded regardless of how they are
	   terminated for compatibility with how common browsers treat entities in the Latin-1
	   range.

	   If $expand_prefix is TRUE then entities without trailing ";" in %entity2char will even
	   be expanded as a prefix of a longer unrecognized name.  The longest matching name in
	   %entity2char will be used. This is mainly present for compatibility with an MSIE
	   misfeature.

	      $string = "foo&nbspbar";
	      _decode_entities($string, { nb => "@", nbsp => "\xA0" }, 1);
	      print $string;  # will print "foo bar"

	   This routine is exported by default.

       encode_entities( $string )
       encode_entities( $string, $unsafe_chars )
	   This routine replaces unsafe characters in $string with their entity representation. A
	   second argument can be given to specify which characters to consider unsafe.  The
	   unsafe characters is specified using the regular expression character class syntax
	   (what you find within brackets in regular expressions).

	   The default set of characters to encode are control chars, high-bit chars, and the
	   "<", "&", ">", "'" and """ characters.  But this, for example, would encode just the
	   "<", "&", ">", and """ characters:

	     $encoded = encode_entities($input, '<>&"');

	   and this would only encode non-plain ascii:

	     $encoded = encode_entities($input, '^\n\x20-\x25\x27-\x7e');

	   This routine is exported by default.

       encode_entities_numeric( $string )
       encode_entities_numeric( $string, $unsafe_chars )
	   This routine works just like encode_entities, except that the replacement entities are
	   always "&#xhexnum;" and never "&entname;".  For example, "encode_entities("r\xF4le")"
	   returns "r&ocirc;le", but "encode_entities_numeric("r\xF4le")" returns "r&#xF4;le".

	   This routine is not exported by default.  But you can always export it with "use
	   HTML::Entities qw(encode_entities_numeric);" or even "use HTML::Entities qw(:DEFAULT
	   encode_entities_numeric);"

       All these routines modify the string passed as the first argument, if called in a void
       context.  In scalar and array contexts, the encoded or decoded string is returned (without
       changing the input string).

       If you prefer not to import these routines into your namespace, you can call them as:

	 use HTML::Entities ();
	 $decoded = HTML::Entities::decode($a);
	 $encoded = HTML::Entities::encode($a);
	 $encoded = HTML::Entities::encode_numeric($a);

       The module can also export the %char2entity and the %entity2char hashes, which contain the
       mapping from all characters to the corresponding entities (and vice versa, respectively).

COPYRIGHT
       Copyright 1995-2006 Gisle Aas. All rights reserved.

       This library is free software; you can redistribute it and/or modify it under the same
       terms as Perl itself.

perl v5.16.3				    2013-03-25				HTML::Entities(3)


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