如何验证一个文本框，只允许使用常规的前pression字母和数字？ [英] How do I validate a text box to only allow letters and numbers using a regular expression?

问题描述

我想验证一个文本框，不使用常规的前pressions接受任何特殊字符。它只是需要的字母和数字从0到9，请为我提供正确的正则表达式。

I want to validate a text box that doesn't accept any special characters using regular expressions. It just takes letters and numbers from 0 to 9. Please provide me the correct regex.

推荐答案

一个普通的前pression将 [A-ZA-Z0-9] * 的一个箱子可能是空或 [A-ZA-Z0-9] + 的盒子，必须在其中至少有一个字符。如果你有一个最小和最大长度，你可以做更多的东西一样 [A-ZA-Z0-9] {M，N} ，其中M是最小长度和n是最大长度，如果你只有一个最小长度，正则表达式看起来更像 [A-ZA-Z0-9] {男，} ，其中M是最小字符数。

A regular expression would be [a-zA-Z0-9]* for a box that could be empty or [a-zA-Z0-9]+ for a box that must have at least one character in it. If you have a minimum and maximum length, you can do something more like [a-zA-Z0-9]{m,n} where m is the minimum length and n is the maximum length and if you only had a minimum length, the regex would look more like [a-zA-Z0-9]{m,} where m was the minimum number of characters.

有关详细信息，您可能需要阅读在ASP 普通防爆pressions这个MSDN文章.NET 。

For more information, you might want to read this MSDN article on Regular Expressions in ASP.NET.

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