Negative Lookahead Regex

const regex = /\b\d+(?!\s*px)\b/g;
const result = str.match(regex);

import re
pattern = re.compile(r'\b\d+(?!\s*px)\b')
result = pattern.findall(text)

import "regexp"
re := regexp.MustCompile(`\b\d+(?!\s*px)\b`)
result := re.FindAllString(text, -1)