如何只提取某个字符后面的数字？

(?<=字符)\d+

import re

text = "这是一个示例字符串，字符后面的数字是123。"
match = re.search(r'(?<=字符)\d+', text)
if match:
    number = match.group()
    print(number)

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

String text = "这是一个示例字符串，字符后面的数字是123。";
Pattern pattern = Pattern.compile("(?<=字符)\\d+");
Matcher matcher = pattern.matcher(text);
if (matcher.find()) {
    String number = matcher.group();
    System.out.println(number);
}

const text = "这是一个示例字符串，字符后面的数字是123。";
const regex = /(?<=字符)\d+/;
const match = text.match(regex);
if (match) {
    const number = match[0];
    console.log(number);
}