単語数・文字数カウンター

// Word count — split on whitespace, filter empty strings
const text = 'Hello  world!  How are you?'
const words = text.trim().split(/\s+/).filter(Boolean)
console.log(words.length) // → 5

// Character count
console.log(text.length)                          // → 27 (with spaces)
console.log(text.replace(/\s/g, '').length)       // → 22 (without spaces)

// Sentence count — split on sentence-ending punctuation
const sentences = text.split(/[.!?]+/).filter(s => s.trim().length > 0)
console.log(sentences.length) // → 2

// Reading time estimate (238 wpm average)
const readingMin = words.length / 238
console.log(Math.ceil(readingMin)) // → 1 min

import re

text = 'Hello  world!  How are you?'

# Word count
words = text.split()
print(len(words))  # → 5

# Character counts
print(len(text))                              # → 27 (with spaces)
print(len(text.replace(' ', '')))             # → 22 (without spaces)

# Sentence count
sentences = [s for s in re.split(r'[.!?]+', text) if s.strip()]
print(len(sentences))  # → 2

# Paragraph count
multiline = """First paragraph.

Second paragraph."""
paragraphs = [p for p in multiline.split('\n\n') if p.strip()]
print(len(paragraphs))  # → 2

package main

import (
	"fmt"
	"strings"
	"unicode"
)

func main() {
	text := "Hello  world!  How are you?"

	// Word count
	words := strings.Fields(text)
	fmt.Println(len(words)) // → 5

	// Character count (rune-aware for Unicode)
	fmt.Println(len([]rune(text))) // → 27

	// Characters without spaces
	noSpaces := strings.Map(func(r rune) rune {
		if unicode.IsSpace(r) {
			return -1
		}
		return r
	}, text)
	fmt.Println(len([]rune(noSpaces))) // → 22
}

# Word count
echo "Hello world" | wc -w
# → 2

# Character count (bytes — use wc -m for multibyte chars)
echo -n "Hello world" | wc -m
# → 11

# Line count
echo -e "line1\nline2\nline3" | wc -l
# → 3

# Count words in a file
wc -w < article.txt
# → 4230