jquery检查字符串是否以1234开头 [英] jquery check if string starts with 1234

问题描述

感谢您抽出宝贵时间回答我的问题。

Thanks for taking the time to answer my question.

我想检查字符串是否有7个字符并以1234开头。我该怎么做？

I want to check if a string has exactly 7 characters and starts with "1234". How do I do that?

我知道string.substring但不确定我是否应该使用正则表达式还是有其他选择。提前致谢！

I know of string.substring but am not sure if I shouold use regex or are there any other alternative. Thanks in advance!

推荐答案

简单的RegExp：

var isMatch = /^1234...$/.test(myString);

或者：

var isMatch = myString.length == 7 && myString.indexOf("1234") == 0;

编辑或：

var isMatch = myString.length == 7 && myString.substr(0, 4) == "1234";

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