u.go

package main

// program to list all unicode characters with a given name
// and their code points
import (
	"fmt"
	"os"
	"regexp"
	"strings"
	"unicode"

	"golang.org/x/text/unicode/runenames"
)

func main() {
	match := regexp.MustCompile(``)
	if len(os.Args) > 1 {
		match = regexp.MustCompile("(?i)" + strings.Join(os.Args[1:], " "))
	}

	// unicode.Common
	rt := unicode.Scripts["Common"]

	print := func(r rune) {
		name := runenames.Name(r)
		if unicode.IsPrint(r) && match.MatchString(name) {
			fmt.Printf("%c %U %s\n", r, r, name)
		}
	}

	for _, r16 := range rt.R16 {
		for r := r16.Lo; r <= r16.Hi; r += r16.Stride {
			print(rune(r))
		}
	}

	for _, r32 := range rt.R32 {
		for r := r32.Lo; r <= r32.Hi; r += r32.Stride {
			print(rune(r))
		}
	}
}