使用查询从变量中提取数字字符串

var str = "abc123def456";
var numStr = str.match(/\d+/g).join("");
console.log(numStr); // 输出：123456

import re

str = "abc123def456"
num_str = ''.join(re.findall(r'\d+', str))
print(num_str) # 输出：123456

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

String str = "abc123def456";
Pattern pattern = Pattern.compile("\\d+");
Matcher matcher = pattern.matcher(str);
StringBuffer numStr = new StringBuffer();
while (matcher.find()) {
    numStr.append(matcher.group());
}
System.out.println(numStr.toString()); // 输出：123456

$str = "abc123def456";
preg_match_all('/\d+/', $str, $matches);
$numStr = implode("", $matches[0]);
echo $numStr; // 输出：123456