正则表达式：允许字母，数字和空格（至少包含一个字母或数字） [英] Regular Expression: Allow letters, numbers, and spaces (with at least one letter or number)

问题描述

我目前正在使用此正则表达式 ^ [A-Z0-9 _] * $ 接受字母，数字，空格和下划线。我需要修改它以在字符串中的某处需要至少一个数字或字母。任何帮助将不胜感激！

I'm currently using this regex ^[A-Z0-9 _]*$ to accept letters, numbers, spaces and underscores. I need to modify it to require at least one number or letter somewhere in the string. Any help would be appreciated!

这将用于验证我的网站的用户名。我实际上想支持尽可能多的字符，但只是想确保我阻止代码注入，并且字符对所有用户都显示正常。所以我肯定对正则表达式验证建议开放，这些建议可以支持更广泛的字符集。

This would be for validating usernames for my website. I'd actually like to support as many characters as I can, but just want to ensure that I prevent code injection and that characters will display fine for all users. So I'm definately open to regex validation suggestions that would support a wider set of characters.

推荐答案

你只需要指定你的当前RE，后跟一个字母/数字，然后是您当前的RE：

You simply need to specify your current RE, followed by a letter/number followed by your current RE again:

^[A-Z0-9 _]*[A-Z0-9][A-Z0-9 _]*$

既然你已经现在声明他们是Javascript RE，有一个有用的网站这里你可以测试RE反对输入数据。

Since you've now stated they're Javascript REs, there's a useful site here where you can test the RE against input data.

如果你想要小写字母：

^[A-Za-z0-9 _]*[A-Za-z0-9][A-Za-z0-9 _]*$

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