[PHP] regex drive me crazy

[jonas_weber]

1. The PHP manual sais to escape the escape char, it has to be written 
twice*, but:
$term = preg_replace('/(\\)/', 'backslash $1', $term);
causes an error** while using three backslashes (see 2.) works.

2.1.
$term = "beg \ end";
print preg_replace('/(\\\)/', 'backslash $1', $term);
returns: beg backslash \ end
2.2.
$term = "beg \\ end";
print preg_replace('/(\\\)/', 'backslash $1', $term);
returns: beg backslash \ end (the same as 2.1.)
2.3.
$term = "beg \\\ end";
print preg_replace('/(\\\)/', 'backslash $1', $term);
returns: beg backslash \backslash \ end
Does this make ANY sense?

- jns

* http://www.php.net/manual/en/pcre.pattern.syntax.php
** "Warning: Compilation failed: missing ) at offset 3 in 
/home/jonas/public_html/test01.php on line 3"



Am Mittwoch, 01.10.03 um 19:14 Uhr schrieb CPT John W. Holmes:
Regular expressions are for "pattern matching"... not matching 
everything
BUT a pattern.
good point! ;)

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