JavaScript Function Regex Pattern

Live Regex Tester

Pattern Breakdown

Code Examples

const regex = /\bfunction\s+([a-zA-Z_$][a-zA-Z0-9_$]*)\s*\(/g;
const test = "function calculateTax(";
console.log(regex.test(test)); // true

// Extract matches
const matches = test.match(regex);
console.log(matches);

import re

pattern = r'\bfunction\s+([a-zA-Z_$][a-zA-Z0-9_$]*)\s*\('
test = "function calculateTax("
match = re.findall(pattern, test)
print(match)  # Found!

package main

import (
    "fmt"
    "regexp"
)

func main() {
    re := regexp.MustCompile(`\bfunction\s+([a-zA-Z_$][a-zA-Z0-9_$]*)\s*\(`)
    fmt.Println(re.MatchString("function calculateTax(")) // true
}

Common Use Cases

Match Examples

About the JavaScript Function Regex

Matches named function declarations in JavaScript, capturing the function name.

Regular expressions (regex) are powerful pattern matching tools used across virtually all programming languages. The javascript function pattern is classified as intermediate difficulty in the code & programming category. This pattern is specifically designed for JavaScript.

When using this regex, always consider edge cases and test thoroughly with real-world data. Use the interactive tester above to validate the pattern against your specific inputs before deploying to production.

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