BytePane

Balanced Parentheses Regex Pattern

Matches innermost balanced parentheses groups. Note: regex alone cannot match nested groups — use recursive patterns or parsers.

Advanced Patterns
Intermediate
Difficulty
Universal
Language
g
Flags
// Regular Expression
/\([^()]*\)/g

Live Regex Tester

Pattern Breakdown

\([^()]*\)
Character class [ ]
Group ( )
Quantifier { }
Anchor ^ $
Repetition * + ?
Escape \
Alternation |
Any char .

Code Examples

JavaScript

const regex = /\([^()]*\)/g;
const test = "(hello world)";
console.log(regex.test(test)); // true

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

Python

import re

pattern = r'\([^()]*\)'
test = "(hello world)"
match = re.findall(pattern, test)
print(match)  # Found!

Go

package main

import (
    "fmt"
    "regexp"
)

func main() {
    re := regexp.MustCompile(`\([^()]*\)`)
    fmt.Println(re.MatchString("(hello world)")) // true
}

Common Use Cases

Expression parsingcode analysismathematical expressions

Match Examples

InputResult
(hello world)Match
((unclosed)No Match

About the Balanced Parentheses Regex

Matches innermost balanced parentheses groups. Note: regex alone cannot match nested groups — use recursive patterns or parsers.

Regular expressions (regex) are powerful pattern matching tools used across virtually all programming languages. The balanced parentheses pattern is classified as intermediate difficulty in the advanced patterns category. It works in all major programming languages.

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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Frequently Asked Questions

What is the Balanced Parentheses regex pattern?

Matches innermost balanced parentheses groups. Note: regex alone cannot match nested groups — use recursive patterns or parsers.

How do I use the Balanced Parentheses regex?

Use the pattern /\([^()]*\)/g in your code. In JavaScript: new RegExp('\([^()]*\)', 'g'). Test it above with your own input.

What does this Balanced Parentheses regex match?

This pattern matches: "(hello world)". It does NOT match: "((unclosed)". Expression parsing, code analysis, mathematical expressions.

Is the Balanced Parentheses regex beginner-friendly?

This pattern is rated Intermediate. It uses some advanced features like character classes and quantifiers.

What languages support the Balanced Parentheses regex?

This pattern works in all major programming languages including JavaScript, Python, Java, C#, Go, Ruby, PHP, and more. Syntax may vary slightly between regex engines.

Can I modify the Balanced Parentheses regex for my use case?

Yes! Use the interactive tester above to modify the pattern and test with your own data. Common modifications include making it case-insensitive (add 'i' flag), matching globally (add 'g' flag), or adjusting character classes.

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