i'm getting nuts with an regular expression. I have a string like this:
%closed% closed (%closed_percent%\%), %open% open (%open_percent%\%)
What I need is a regular expression that matches the following:
%closed%
%closed_percent%
%open%
%open_percent%
but not the two \%
At the moment I use:
\%([^\%]+)\%
that gives me:
%closed%
%closed_percent%
%), %
% open (%
...
Anyone can help me with that?
The simple way:
%\w+%
Matches: %foo%
Allows (multiple) backslash escapes:
(?<!\\)(?:\\.)*%(\w+)%
Matches only bar in: \%foo% \\%bar% \\\%baz%
...and this allows escapes inside of it too:
(?<!\\)(?:\\.)*%((?:[^\\%\s]+|\\.)+)%
Matches: %foo\%bar%
Use the value of the first capturing group with the last two expressions.
[^\%\s] to [^\\%\s] to get it to work - you want a literal backslash, most flavors will see \% and ignore the backslash, as if you wrote %. By the way, why are everyone escaping the present sign? Does it mean anything in any flavor?
%+ %-. Same goes for @.Try this:
\%([^(\\\%)]+?)\%
matches
%closed%
%closed_percent%
%open%
%open_percent%
for me.
Assuming no restrictions on what can be in the percent wrapped tokens (including escaped characters), and what characters can be escaped (so backslashes can also be escaped: \\%token% should be valid),
here's a pattern you can use to skip over escaped characters:
\\.|(%([^%\\]|\\.)+%)
This will capture the percent-wrapped tokens, and will capture them in the first group ($1). Escaped characters will also be matched (it's a nice trick to skip over them), but using PHP it is very easy to get just the relevant tokens:
preg_match_all('/\\\\.|(%([^%\\\\]|\\\\.)+%)/', $str, $matches, PREG_PATTERN_ORDER);
$matches = array_filter($matches[1]);
Working example: http://ideone.com/dziCB
Try:
~\%\w+\%~
So, allow only a-z A-Z and _ in your selection.
$str = "%closed% closed (%closed_percent%\%), %open% open (%open_percent%\%)";
preg_match_all("~\%\w+\%~", $str, $matches);
$matches now contains:
Array
(
[0] => Array
(
[0] => %closed%
[1] => %closed_percent%
[2] => %open%
[3] => %open_percent%
)
)
Add negative lookbehinds for the backslashes! That way \% is ignored, as intended.
(?<!\\)\%([^\%]+)(?<!\\)\%
Matches
%closed%
%closed_percent%
%open%
%open_percent%
