European Date Format (DD/MM/YYYY) in GO
Match European-style dates in DD/MM/YYYY format with valid day (01–31) and month (01–12) ranges.
Try it in the GO tester →Pattern
regexGO
(?:0[1-9]|[12]\d|3[01])\/(?:0[1-9]|1[0-2])\/\d{4} (flags: g)Go (RE2) code
goGo
package main
import (
"fmt"
"regexp"
)
func main() {
re := regexp.MustCompile(`(?:0[1-9]|[12]\d|3[01])\/(?:0[1-9]|1[0-2])\/\d{4}`)
input := `15/01/2024`
for _, match := range re.FindAllString(input, -1) {
fmt.Println(match)
}
}Uses `regexp.MustCompile` (panics on bad patterns at startup) and `FindAllString` for all matches.
How the pattern works
Day alternation covers 01–31, month covers 01–12, year is any 4-digit number. Slashes are literal. Does not detect impossible combinations like 31/02/2024.
Examples
Input
15/01/2024Matches
15/01/2024
Input
31/12/1999Matches
31/12/1999
Input
32/01/2024No match
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