正则表达式语法 - REGEX [英] Regular expression syntax - REGEX

问题描述

大家好，



我需要强制提交正则表达式语法。



请帮助任何人。



我的尝试：



我试过这个< b> ^ [\ w] {1} $



但它只允许一个字符。多个角色失败。

Hi everyone,

I need mandatory filed regular expression syntax.

Please help any one.

What I have tried:

Am tried this one ^[\w]{1}$

But its allowed only one character. more than one character failed.

推荐答案

但是只允许一个角色。多个角色失败。

But its allowed only one character. more than one character failed.

我试过这个^ [\w] {1}

Am tried this one ^[\w]{1}

但它只允许一个字符。不止一个角色失败了。

那是因为这正是你告诉它要做的事情：{1}意味着正是其中之一 - 并且是多余的，正如大多数正则表达式一样，减少到：

But its allowed only one character. more than one character failed.
That's because that is exactly what you told it to do: {1} means "exactly one of" - and is redundant, as is most of that Regex, which reduces to:

^\w

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