Regex Editor & Tester

Matches lines in a 'key = value' format, capturing the key (one or more letters, digits, or underscores) in group 1 and the value (any remaining characters) in group 2, tolerating optional spaces around the equals sign. The multiline flag allows it to process each line of input independently. Commonly used for parsing configuration files, INI-style settings, environment variable assignments, or expression definitions.