PHP: Best way to extract text within parenthesis?
PhpParsingStringPhp Problem Overview
What's the best/most efficient way to extract text set between parenthesis? Say I wanted to get the string "text" from the string "ignore everything except this (text)" in the most efficient manner possible.
So far, the best I've come up with is this:
$fullString = "ignore everything except this (text)";
$start = strpos('(', $fullString);
$end = strlen($fullString) - strpos(')', $fullString);
$shortString = substr($fullString, $start, $end);
Is there a better way to do this? I know in general using regex tends to be less efficient, but unless I can reduce the number of function calls, perhaps this would be the best approach? Thoughts?
Php Solutions
Solution 1 - Php
i'd just do a regex and get it over with. unless you are doing enough iterations that it becomes a huge performance issue, it's just easier to code (and understand when you look back on it)
$text = 'ignore everything except this (text)';
preg_match('#\((.*?)\)#', $text, $match);
print $match[1];
Solution 2 - Php
So, actually, the code you posted doesn't work: substr()'s
parameters are $string, $start and $length, and strpos()'s
parameters are $haystack
, $needle
. Slightly modified:
$str = "ignore everything except this (text)"; $start = strpos($str, '('); $end = strpos($str, ')', $start + 1); $length = $end - $start; $result = substr($str, $start + 1, $length - 1);
Some subtleties: I used $start + 1
in the offset parameter in order to help PHP out while doing the strpos()
search on the second parenthesis; we increment $start
one and reduce $length
to exclude the parentheses from the match.
Also, there's no error checking in this code: you'll want to make sure $start
and $end
do not === false before performing the substr
.
As for using strpos/substr
versus regex; performance-wise, this code will beat a regular expression hands down. It's a little wordier though. I eat and breathe strpos/substr
, so I don't mind this too much, but someone else may prefer the compactness of a regex.
Solution 3 - Php
Use a regular expression:
if( preg_match( '!\(([^\)]+)\)!', $text, $match ) )
$text = $match[1];
Solution 4 - Php
i think this is the fastest way to get the words between the first parenthesis in a string.
$string = 'ignore everything except this (text)';
$string = explode(')', (explode('(', $string)[1]))[0];
echo $string;
Solution 5 - Php
This is a sample code to extract all the text between '[' and ']' and store it 2 separate arrays(ie text inside parentheses in one array and text outside parentheses in another array)
function extract_text($string)
{
$text_outside=array();
$text_inside=array();
$t="";
for($i=0;$i<strlen($string);$i++)
{
if($string[$i]=='[')
{
$text_outside[]=$t;
$t="";
$t1="";
$i++;
while($string[$i]!=']')
{
$t1.=$string[$i];
$i++;
}
$text_inside[] = $t1;
}
else {
if($string[$i]!=']')
$t.=$string[$i];
else {
continue;
}
}
}
if($t!="")
$text_outside[]=$t;
var_dump($text_outside);
echo "\n\n";
var_dump($text_inside);
}
Output: extract_text("hello how are you?"); will produce:
array(1) {
[0]=>
string(18) "hello how are you?"
}
array(0) {
}
extract_text("hello [http://www.google.com/test.mp3] how are you?"); will produce
array(2) {
[0]=>
string(6) "hello "
[1]=>
string(13) " how are you?"
}
array(1) {
[0]=>
string(30) "http://www.google.com/test.mp3"
}
Solution 6 - Php
The already posted regex solutions - \((.*?)\)
and \(([^\)]+)\)
- do not return the innermost strings between an open and close brackets. If a string is Text (abc(xyz 123)
they both return a (abc(xyz 123)
as a whole match, and not (xyz 123)
.
The pattern that matches substrings (use with preg_match
to fetch the first and preg_match_all
to fetch all occurrences) in parentheses without other open and close parentheses in between is, if the match should include parentheses:
\([^()]*\)
Or, you want to get values without parentheses:
\(([^()]*)\) // get Group 1 values after a successful call to preg_match_all, see code below
\(\K[^()]*(?=\)) // this and the one below get the values without parentheses as whole matches
(?<=\()[^()]*(?=\)) // less efficient, not recommended
Replace *
with +
if there must be at least 1 char between (
and )
.
Details:
\(
- an opening round bracket (must be escaped to denote a literal parenthesis as it is used outside a character class)[^()]*
- zero or more characters other than(
and)
(note these(
and)
do not have to be escaped inside a character class as inside it,(
and)
cannot be used to specify a grouping and are treated as literal parentheses)\)
- a closing round bracket (must be escaped to denote a literal parenthesis as it is used outside a character class).
The \(\K
part in an alternative regex matches (
and omits from the match value (with the \K
match reset operator). (?<=\()
is a positive lookbehind that requires a (
to appear immediately to the left of the current location, but the (
is not added to the match value since lookbehind (lookaround) patterns are not consuming. (?=\()
is a positive lookahead that requires a )
char to appear immediately to the right of the current location.
$fullString = 'ignore everything except this (text) and (that (text here))';
if (preg_match_all('~\(([^()]*)\)~', $fullString, $matches)) {
print_r($matches[0]); // Get whole match values
print_r($matches[1]); // Get Group 1 values
}
Output:
Array ( [0] => (text) [1] => (text here) )
Array ( [0] => text [1] => text here )
Solution 7 - Php
This function may be useful.
public static function getStringBetween($str,$from,$to, $withFromAndTo = false)
{
$sub = substr($str, strpos($str,$from)+strlen($from),strlen($str));
if ($withFromAndTo)
return $from . substr($sub,0, strrpos($sub,$to)) . $to;
else
return substr($sub,0, strrpos($sub,$to));
}
$inputString = "ignore everything except this (text)";
$outputString = getStringBetween($inputString, '(', ')'));
echo $outputString;
//output will be test
$outputString = getStringBetween($inputString, '(', ')', true));
echo $outputString;
//output will be (test)
strpos() => which is used to find the position of first occurance in a string.
strrpos() => which is used to find the position of first occurance in a string.
Solution 8 - Php
function getStringsBetween($str, $start='[', $end=']', $with_from_to=true){
$arr = [];
$last_pos = 0;
$last_pos = strpos($str, $start, $last_pos);
while ($last_pos !== false) {
$t = strpos($str, $end, $last_pos);
$arr[] = ($with_from_to ? $start : '').substr($str, $last_pos + 1, $t - $last_pos - 1).($with_from_to ? $end : '');
$last_pos = strpos($str, $start, $last_pos+1);
}
return $arr; }
this is a little improvement to the previous answer that will return all patterns in array form:
getStringsBetween('[T]his[] is [test] string [pattern]') will return: