Scientific Notation

const re = new RegExp("^-?\\d+(\\.\\d+)?[eE][+-]?\\d+$", "");
const input = "1.5e10";
const match = input.match(re);
console.log(match ? match[0] : null);

import re

pattern = re.compile(r"^-?\d+(\.\d+)?[eE][+-]?\d+$")
input_text = "1.5e10"
for m in pattern.finditer(input_text):
    print(m.group(0))

package main

import (
	"fmt"
	"regexp"
)

func main() {
	re := regexp.MustCompile(`^-?\d+(\.\d+)?[eE][+-]?\d+$`)
	input := `1.5e10`
	for _, match := range re.FindAllString(input, -1) {
		fmt.Println(match)
	}
}