php-regexHow to use regex flags in PHP?

Regex flags are used to modify the behavior of a regular expression in PHP.

The most commonly used flags are i for case-insensitive matching, m for multiline matching, and s for dotall mode.

Example code

$pattern = '/^[a-z]$/i';
$string = 'A';

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

Output example

Match found

Code explanation

• $pattern: The regular expression pattern to be used for matching.
• $string: The string to be matched against the pattern.
• preg_match(): The function used to match the string against the pattern.
• /i: The regex flag used to make the pattern case-insensitive.

Helpful links

• PHP Regex Flags
• PHP preg_match() Function

Edit this code on GitHub