Wie extrahiere ich Zeichenfolgen zwischen zwei Zeichen in PHP?

How to Isolate Strings Between Characters in PHP

For scenarios where you need to retrieve a specific section of a string, PHP provides tools beyond the standard substr() function. This article addresses extracting a substring between two designated characters.

Solution 1: Utilizing a Regular Expression

One approach involves utilizing regular expressions (regex) with the preg_match() function. Here's how it's done:

<code class="php">$input = "[modid=256]";
preg_match('~=(.*?)]~', $input, $output);
echo $output[1]; // Output: 256</code>

In the regex syntax, (.*?) matches any character sequence until the presence of the second character. The captured sequence is then assigned to the first index of the $output array.

Alternative Solution 2: Using String Manipulation

Alternatively, you can manipulate strings directly using PHP's string functions:

<code class="php">$firstChar = '=';
$secondChar = ']';
$substring = substr($input, strpos($input, $firstChar) + 1, strrpos($input, $secondChar) - strpos($input, $firstChar) - 1);
echo $substring; // Output: 256</code>

This approach uses strpos() to find the starting and ending positions of the substring within the input string.

Demo and Working Example

If you're looking for a live demonstration, you can check out the following code snippet online at http://codepad.viper-7.com/0eD2ns.

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