What are best practices for working with regex recursion and (?(DEFINE))?

Best practices for working with regex recursion and (?(DEFINE)) involve understanding the structure and limitations of the regex engine you are using. Properly defining reusable patterns can simplify complex matching scenarios and enhance the readability of your code.

regex recursion, (?(DEFINE)), Perl regex, regex best practices, recursive patterns


        <?php
        // Example of recursive regex using (?(DEFINE))
        $pattern = '/
            (?(DEFINE)        # Define recursive patterns
                      \d+  # Match digits
            )
            \[(?<number>)   # Recursively match digits inside brackets
            \]                  # Closing bracket
        /x';

        $subject = "[123]";
        if (preg_match($pattern, $subject, $matches)) {
            echo "Match found: " . htmlspecialchars($matches[0]);
        } else {
            echo "No match found.";
        }
        ?>

What are best practices for working with regex recursion and (?(DEFINE))?

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What are best practices for working with regex recursion and (?(DEFINE))?

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