正则表达式以匹配数字，然后是下划线和数字? [英] Regular expression to match numbers followed by underscore and numbers?

问题描述

我正在尝试编写正则表达式以使用javascript进行验证.我的要求是验证数字，然后跟下划线，并且它也应该有数字.

I am trying to write a regular expression to do validation in javascript. My requirement is to validate numbers followed by underscore and again it should have numbers.

For example: 123456789_123456789

长度不是约束.它可以具有 n 个数字，下划线和 n 个数字.目前，我尝试使用此 [0-9] _ [0-9] .有什么更好的方法吗?任何建议表示赞赏.

Length is not a constraint. It can have n numbers, underscore and n numbers. Currently i tried with this [0-9]_[0-9]. Is there any better way of doing it ? Any suggestion is appreciated.

谢谢，Sreekanth

Thanks, Sreekanth

推荐答案

您几乎明白了.正确的正则表达式为:

You almost got it. The correct regex would be :

^[0-9]{1,}_[0-9]{1,}$

或

^[0-9]+_[0-9]+$

正则表达式表示:"一个或多个数字( [0-9] {1，} )，后跟下划线( _ )，然后再输入一位或多位数字( [0-9] {1，} ).

The regex means: "one or more digits ([0-9]{1,}), followed by an underscore (_) and then again one or more digits ([0-9]{1,}).

此匹配项:

12312_123123
1_1

但不匹配:

123123_
_123123
_
123123_1231ddd
123dd_123
dd123_123

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