文本框中的数值验证 [英] numeric validation in textbox

问题描述

我希望文本框的来源仅输入电话号码，并允许+进入文本框的起始电话号码.例如:[phone]

i want source for textbox only enter phone number and allow + into the textbox starting phone number. for ex:[phone]

推荐答案

使用模式为^\+?\d+

Using a regular expression validator with the pattern ^\+?\d+

的正则表达式验证器将执行您需要的验证

^\+?表示文本只能在文本开头包含零个或一个+ charcater实例.

\d+

will perform the validation you need

^\+? means that the text can contain zero or one instance of the + charcater at the start of the text only

\d+

表示文本必须在文本末尾之前包含一个或多个数字

我建议您下载Expresso之类的免费工具，以帮助您进行正则表达式创建过程

means that the text must then contain one or more digits before the end of the text

I would recommend that you download a free tool like Expresso to help you with your regex creation process

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