100% Client-Side • 0 B Data Leaves Browser
formatting
12-Hour Time with AM/PM Regex
Validates standard 12-hour time formats with case-insensitive AM or PM indicators.
Regular Expression Pattern:
/^(?:1[0-2]|0?[1-9]):[0-5]\d\s*(?:[AaPp][Mm])$/
Valid Match Example:
11:45 PM
Invalid / Non-Match Example:
13:00 PM
Regex Syntax Breakdown & Explanation
- •(?:1[0-2]|0?[1-9]) : Hours 1 through 12 with optional leading zero
- •: : Time colon delimiter
- •[0-5]\d : Valid minute representation 00-59
- •\s*(?:[AaPp][Mm]) : Optional space followed by AM or PM designation
Implementation in Popular Languages
JavaScript / TypeScript
const regex = /^(?:1[0-2]|0?[1-9]):[0-5]\d\s*(?:[AaPp][Mm])$/;
const isValid = regex.test("11:45 PM");
console.log(isValid); // truePython (re)
import re pattern = r"^(?:1[0-2]|0?[1-9]):[0-5]\d\s*(?:[AaPp][Mm])$" match = re.match(pattern, "11:45 PM") print(bool(match)) # True
Go (regexp)
package main
import (
"fmt"
"regexp"
)
func main() {
re := regexp.MustCompile(`^(?:1[0-2]|0?[1-9]):[0-5]\d\s*(?:[AaPp][Mm])$`)
fmt.Println(re.MatchString("11:45 PM"))
}Frequently Asked Questions
Frequently Asked Questions
Everything you need to know regarding specifications, syntax, and security best practices.
The regular expression pattern is /^(?:1[0-2]|0?[1-9]):[0-5]\d\s*(?:[AaPp][Mm])$/. Validates standard 12-hour time formats with case-insensitive AM or PM indicators.