How to Extract a Substring Between Characters Using PHP\'s preg_match()?

Extracting a Substring Between Two Characters in PHP

The PHP preg_match() function can be used to extract a substring between two specific characters within a string. This can be useful for parsing text and extracting specific data.

Let's consider an example:

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

In this code:

• preg_match() is called with the ~=(.*?)]~ pattern. This pattern looks for a substring that starts with an equal sign (=), followed by any character zero or more times (.*?), and ends with a closing square bracket (]).
• The extracted substring is captured into the $output array.
• We access the extracted substring from the $output[1] index.

In the example above, the extracted substring would be "256". This technique is particularly useful when you need to extract specific information from text where the substring is surrounded by known characters.

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