Webflags: g

Cookie Header Value

Parse name=value pairs from an HTTP `Cookie:` header value.

Available in

JavaScript / ECMAScript code

jsJavaScript

const re = new RegExp("([^=;\\s]+)=([^;]+)", "g");
const input = "session=abc123; theme=dark; user_id=42";
const matches = [...input.matchAll(re)];
console.log(matches.map(m => m[0]));

Uses `String.prototype.matchAll` for global iteration (Node 12+ / all modern browsers).

Python (re) code

pyPython

import re

pattern = re.compile(r"([^=;\s]+)=([^;]+)")
input_text = "session=abc123; theme=dark; user_id=42"
for m in pattern.finditer(input_text):
    print(m.group(0))

Stdlib `re` module — no third-party dependency. Works on Python 3.6+.

Go (RE2) code

goGo

package main

import (
	"fmt"
	"regexp"
)

func main() {
	re := regexp.MustCompile(`([^=;\s]+)=([^;]+)`)
	input := `session=abc123; theme=dark; user_id=42`
	for _, match := range re.FindAllString(input, -1) {
		fmt.Println(match)
	}
}

Uses `regexp.MustCompile` (panics on bad patterns at startup) and `FindAllString` for all matches.

Pattern

regexengine-agnostic

([^=;\s]+)=([^;]+)   (flags: g)

Raw source: ([^=;\s]+)=([^;]+)

How it works

([^=;\s]+) captures the cookie name — characters that aren't equals, semicolon, or whitespace. = is the literal separator. ([^;]+) captures the value — everything up to the next semicolon, allowing spaces and special chars inside the value. Repeats globally to capture every cookie.