US Currency (USD)

const re = new RegExp("^\\$?\\d{1,3}(,\\d{3})*(\\.\\d{2})?$", "");
const input = "$1,234.56";
const match = input.match(re);
console.log(match ? match[0] : null);

import re

pattern = re.compile(r"^\$?\d{1,3}(,\d{3})*(\.\d{2})?$")
input_text = "$1,234.56"
for m in pattern.finditer(input_text):
    print(m.group(0))

package main

import (
	"fmt"
	"regexp"
)

func main() {
	re := regexp.MustCompile(`^\$?\d{1,3}(,\d{3})*(\.\d{2})?$`)
	input := `$1,234.56`
	for _, match := range re.FindAllString(input, -1) {
		fmt.Println(match)
	}
}