如何正则表达式匹配所有大小写

[a-zA-Z]

import re

pattern = r'[a-zA-Z]'
text = "Hello World! 123"

matches = re.findall(pattern, text)
print(matches)  # 输出: ['H', 'e', 'l', 'l', 'o', 'W', 'o', 'r', 'l', 'd']

const pattern = /[a-zA-Z]/g;
const text = "Hello World! 123";

const matches = text.match(pattern);
console.log(matches);  // 输出: ['H', 'e', 'l', 'l', 'o', 'W', 'o', 'r', 'l', 'd']

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class RegexExample {
    public static void main(String[] args) {
        String pattern = "[a-zA-Z]";
        String text = "Hello World! 123";

        Pattern compiledPattern = Pattern.compile(pattern);
        Matcher matcher = compiledPattern.matcher(text);

        while (matcher.find()) {
            System.out.print(matcher.group() + " ");  // 输出: H e l l o W o r l d
        }
    }
}