Regular Expressions 101

Group 1(\bfunction((?!function).)*\((.*?)\)\s*{)

\ban ASCII word boundary

functionthe literal text function (case insensitive)

Group 2((?!function).)*

*repeats the group contents below any number of times:

Negative Lookahead(?!function)

functionthe literal text function (case insensitive)

.any character (except for line terminators)

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

Group 3(.*?)

.*?any character (except for line terminators), repeated any number of times

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

\s*any whitespace character, repeated any number of times

{the literal { (123₁₀ / 173₈ / 7B₁₆)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(\bfunction((?!function).)*\((.*?)\)\s*{)

New

/** * recursive function to do whatever */ function demo (el, hop) { /*whatever*/ }
function to do whatever */ function demo (el, hop) {