dongshan9619 2018-08-27 05:39
浏览 340
已采纳

正则表达式 - 在字符串中查找8位数字[关闭]

I want to extract 8 digit number from string using regex.

Test strings are

hi 82799162, 236232 (82342450), test data 8979

Required respective output should be

82799162, 82342450, null

I have tried following codes:

  • preg_match('/[0-9]{8}$/', $string, $match);
  • preg_match('/\d{8}$/', $string, $match);

But it does not retrieve the number from 236232 (82342450).

  • 写回答

2条回答 默认 最新

  • duan4739 2018-08-27 05:47
    关注

    The problem is with your $ sign, and it is used to indicate the end of your expression. So basically, with that expression, you are looking for a string which ends with a 8 digit number. But in your second test string; '236232 (82342450)', ends with a bracket, and therefore it doesn't match the criteria (does not end with a number).

    So remove the trailing $ and it will work.

    preg_match('/[0-9]{8}/',$string,$match);
    

    Hope it helps!!

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论
查看更多回答(1条)

报告相同问题?

悬赏问题

  • ¥20 求一个html代码,有偿
  • ¥100 关于使用MATLAB中copularnd函数的问题
  • ¥20 在虚拟机的pycharm上
  • ¥15 jupyterthemes 设置完毕后没有效果
  • ¥15 matlab图像高斯低通滤波
  • ¥15 针对曲面部件的制孔路径规划,大家有什么思路吗
  • ¥15 钢筋实图交点识别,机器视觉代码
  • ¥15 如何在Linux系统中,但是在window系统上idea里面可以正常运行?(相关搜索:jar包)
  • ¥50 400g qsfp 光模块iphy方案
  • ¥15 两块ADC0804用proteus仿真时,出现异常