Regex Editor & Tester

Matches a JavaScript function declaration at the start of a string, capturing the function name (word characters only) before the opening parenthesis. Useful for extracting function names from source code or from the stringified form of constructor functions like 'function String() { [native code] }'. In Vue Devtools, this pattern is applied to a constructor's string representation to identify a prop's type constructor name (e.g., String, Number, Boolean).