php-regexHow to use PHP regex in a case insensitive mode?

To use PHP regex in a case insensitive mode, you can use the i modifier. This modifier will make the regex match case insensitively.

For example:

$string = 'Hello World';
$pattern = '/hello/i';

if (preg_match($pattern, $string)) {
    echo 'Match found';
}

Output example

Match found

The i modifier can be used with any regex pattern. It is placed after the closing / of the pattern.

Code explanation

• i modifier: This modifier makes the regex match case insensitively.
• preg_match(): This function is used to match a regex pattern against a string.

Helpful links

• PHP preg_match()
• PHP Regular Expression Syntax

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