Check if String Contains Brackets in PHP

This tutorial will discuss how to check if string contains brackets in PHP.

To check if a string contains brackets in PHP, we can utilize regular expressions. The regular expression pattern that should match a string that contains both opening and closing brackets in the correct order is as follows,

'/(S*)|[S*]|{S*}/'

We can pass this regex pattern and the string value to the preg_match() function. If the string contains both opening and closing brackets in the correct order, the function will return 1, indicating a match.

We have created a separate function,

function hasBrackets($strValue)
{
    return preg_match('/(S*)|[S*]|{S*}/', $strValue) === 1;
}

It accepts a string as an argument and returns true if the given string contains both opening and closing brackets in the correct order.

Let’s see the complete example,

<?php
/**
 * Check if a string contains brackets.
 *
 * @param string $strValue The string to validate.
 * @return bool True if the string contains brackets, false otherwise.
 */
function hasBrackets($strValue)
{
    return preg_match('/(S*)|[S*]|{S*}/', $strValue) === 1;
}

$strValue = 'This random text which (contains) brackets for [testing]';

if (hasBrackets($strValue)) {
    echo "The string contains brackets.";
} else {
    echo "The string does not contain brackets.";
}
?>

Output

The string contains brackets.

Summary

Today, we learned how to check if string contains brackets in PHP.