main_test.go

package main

import (
	"regexp"
	"testing"
)

var testString = "abcdef1234567890ABCDEF"

// Original: Dynamic Regex Compilation
func matchValidShaCharsDynamic(s string) bool {
	match, _ := regexp.MatchString("^[a-fA-F0-9]+$", s)
	return match
}

// Optimized: Precompiled Regex
var validShaCharsRegex = regexp.MustCompile("^[a-fA-F0-9]+$")

func matchValidShaCharsPrecompiled(s string) bool {
	return validShaCharsRegex.MatchString(s)
}

// Optimized: Manual Character Check
func matchValidShaCharsManual(s string) bool {
	for i := 0; i < len(s); i++ {
		c := s[i]
		if !(c >= '0' && c <= '9') && !(c >= 'a' && c <= 'f') && !(c >= 'A' && c <= 'F') {
			return false
		}
	}
	return true
}

func BenchmarkMatchValidShaCharsDynamic(b *testing.B) {
	for i := 0; i < b.N; i++ {
		matchValidShaCharsDynamic(testString)
	}
}

func BenchmarkMatchValidShaCharsPrecompiled(b *testing.B) {
	for i := 0; i < b.N; i++ {
		matchValidShaCharsPrecompiled(testString)
	}
}

func BenchmarkMatchValidShaCharsManual(b *testing.B) {
	for i := 0; i < b.N; i++ {
		matchValidShaCharsManual(testString)
	}
}