What are some best practices for troubleshooting and debugging regular expression patterns in PHP code?

When troubleshooting and debugging regular expression patterns in PHP code, it is important to use the built-in functions such as preg_match() or preg_match_all() to test your patterns against sample input data. Additionally, using online regex testers like regex101.com can help visualize the matching process and identify any issues with your pattern. It is also recommended to break down complex patterns into smaller parts and test each part individually to isolate the problem. 

$pattern = '/[0-9]+/';
$input = 'abc123def456ghi';

if (preg_match($pattern, $input, $matches)) {
    echo 'Match found: ' . $matches[0];
} else {
    echo 'No match found';
}

Keywords

Regular expressions PHP code troubleshooting debugging patterns

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