How Can I Find All Occurrences of a String in PHP Using `preg_match_all()`?

Finding Multiple Occurrences with preg_match_all in PHP

Question:

How to utilize PHP's preg_match to identify multiple occurrences of a specific string within a given text?

Example:

Suppose we want to determine whether the string "/brown fox jumped [0-9]/" appears twice within the following paragraph:

$string = "/brown fox jumped [0-9]/";

$paragraph = "The brown fox jumped 1 time over the fence. The green fox did not. Then the brown fox jumped 2 times over the fence.";

Answer:

While preg_match can detect the first occurrence of a string, to locate multiple occurrences, we must use the preg_match_all() function. The corrected code using preg_match_all() is below:

if (preg_match_all($string, $paragraph, $matches)) {
    echo count($matches[0]) . " matches found";
} else {
    echo "match NOT found";
}

In this code, $matches is an array that contains all the matches found. The count($matches[0]) expression returns the number of matches.

Output:

This code will produce the following output since the given string appears twice within the paragraph:

2 matches found

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