提取字符串PHP中两个字符之间的子字符串

Question

Is there a PHP function that can extract a phrase between 2 different characters in a string? Something like substr() ;

Example:

$String = "[modid=256]";

$First = "=";
$Second = "]";

$id = substr($string, $First, $Second);

Thus $id would be 256

Any help would be appreciated :)

Answer 1

use this code

$input = "[modid=256]";
preg_match('~=(.*?)]~', $input, $output);
echo $output[1]; // 256

working example http://codepad.viper-7.com/0eD2ns

Answer 2

Use:

<?php

$str = "[modid=256]";
$from = "=";
$to = "]";

echo getStringBetween($str,$from,$to);

function getStringBetween($str,$from,$to)
{
    $sub = substr($str, strpos($str,$from)+strlen($from),strlen($str));
    return substr($sub,0,strpos($sub,$to));
}

?>

Answer 3

$String = "[modid=256]";

$First = "=";
$Second = "]";

$Firstpos=strpos($String, $First);
$Secondpos=strpos($String, $Second);

$id = substr($String , $Firstpos, $Secondpos);

Answer 4

If you don't want to use reqular expresion, use strstr , trim and strrev functions:

// Require PHP 5.3 and higher
$id = trim(strstr(strstr($String, '='), ']', true), '=]');

// Any PHP version
$id = trim(strrev(strstr(strrev((strstr($String, '='))), ']')), '=]');

Answer 5

Regular Expression is your friend.

preg_match("/=(\d+)\]/", $String, $matches);
var_dump($matches);

This will match any number, for other values you will have to adapt it.

Answer 6

You can use a regular expression:

<?php
$string = "[modid=256][modid=345]";
preg_match_all("/\[modid=([0-9]+)\]/", $string, $matches);

$modids = $matches[1];

foreach( $modids as $modid )
  echo "$modid\n";

http://eval.in/9913

Answer 7

$str = "[modid=256]";
preg_match('/\[modid=(?P<modId>\d+)\]/', $str, $matches);

echo $matches['modId'];

Answer 8

(moved from comment because formating is easier here)

might be a lazy approach, but in such cases i usually would first explode my string like this:

$string_array = explode("=",$String); 

and in a second step i would get rid of that "]" maybe through rtrim:

$id = rtrim($string_array[1], "]");

...but this will only work if the structure is always exactly the same...

-cheers-

ps: shouldn't it actually be $String = "[modid=256]"; ?

Answer 9

Try Regular Expression

$String =" [modid=256]";
$result=preg_match_all('/(?<=(=))(\d+)/',$String,$matches);
print_r($matches[0]);

Output

Array ( [0] => 256 )

DEMO

Explanation Here its used the Positive Look behind (?<=)in regular expression eg (?<=foo)bar matches bar when preceded by foo, here (?<=(=))(\\d+) we match the (\\d+) just after the '=' sign. \\d Matches any digit character (0-9). + Matches 1 or more of the preceeding token

Answer 10

I think this is the way to get your string:

<?php
function get_string_between($string, $start, $end){
    $string = ' ' . $string;
    $ini = strpos($string, $start);
    if ($ini == 0) return '';
    $ini += strlen($start);
    $len = strpos($string, $end, $ini) - $ini;
    return substr($string, $ini, $len);
}


$fullstring = '.layout { 

color: {{ base_color }} 

}

li { 

color: {{ sub_color }} 

} 

.text { 

color: {{ txt_color }}

 }

 .btn { 

color: {{ btn_color }}

 }

.more_text{

color:{{more_color}}

}';

  $parsed = get_string_between($fullstring, '{{', '}}');
  echo $parsed;
?>

Answer 11

You can use a regular expression or you can try this:

$String = "[modid=256]";

$First = "=";
$Second = "]";
$posFirst = strpos($String, $First); //Only return first match
$posSecond = strpos($String, $Second); //Only return first match

if($posFirst !== false && $posSecond !== false && $posFirst < $posSecond){
    $id = substr($string, $First, $Second);
}else{
//Not match $First or $Second
}

You should read about substr. The best way for this is a regular expression.