Decimal Number Regex Pattern

Live Regex Tester

Pattern Breakdown

Code Examples

const regex = /^-?\d+\.?\d*$/;
const test = "3.14159";
console.log(regex.test(test)); // true

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

import re

pattern = r'^-?\d+\.?\d*$'
test = "3.14159"
match = re.search(pattern, test)
print(match)  # Found!

package main

import (
    "fmt"
    "regexp"
)

func main() {
    re := regexp.MustCompile(`^-?\d+\.?\d*$`)
    fmt.Println(re.MatchString("3.14159")) // true
}

Common Use Cases

Match Examples

About the Decimal Number Regex

Matches integers and decimal numbers with optional negative sign. Allows trailing decimals for flexible number parsing.

Regular expressions (regex) are powerful pattern matching tools used across virtually all programming languages. The decimal number pattern is classified as beginner difficulty in the numbers 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.

More Numbers Patterns