oci_image_regex.go

package main

import (
	"fmt"
	"strings"

	"github.com/distribution/reference"
)

// Converts Golang regex counterparts to JavaScript equivalents
func useJSCounterparts(input string) string {
	output := input
	output = strings.ReplaceAll(output, `[:xdigit:]`, `0-9a-fA-F`)
	output = strings.ReplaceAll(output, `\w`, `A-Za-z0-9`)
	return output
}

// Escapes forward slashes for JavaScript regex literals
func escapeSlashes(input string) string {
	return strings.ReplaceAll(input, `/`, `\/`)
}

// Escapes backslashes for JavaScript string representation
func escapeBackslashes(input string) string {
	return strings.ReplaceAll(input, `\`, `\\`)
}

func main() {
	golangRegex := reference.ReferenceRegexp.String()
	jsRegex := useJSCounterparts(golangRegex)
	escapedJSRegex := escapeSlashes(jsRegex)
	escapedJSStringRegex := escapeBackslashes(jsRegex)

	fmt.Printf("Golang expression: %s\n", golangRegex)
	fmt.Printf("ECMAScript expression: /%s/\n", escapedJSRegex)
	fmt.Printf("ECMAScript string expression: %s\n", escapedJSStringRegex)
}