Codeigniter 的正则表达式匹配 [英] Codeigniter's regex match

问题描述

我有这个正则表达式用于 javascript 中的验证:

I have this regular expression for validation in javascript:

/^(?:'[A-z](([._-][A-z0-9])|[A-z0-9])*[a-z0-9_]*')$/

现在我想要使用 Codeigniter 的表单验证进行表单验证的相同正则表达式:

Now I want the same regular expression for the form validation using Codeigniter's form validation:

$this->form_validation->set_rules('username', 'Nombre de usuario', 'required|min_length[2]|max_length[15]|regex_match[/^[A-Z a-z 0-9 _ . -]+$/]|is_unique[user.username]');

该行中的正则表达式与我提到的不同.

the regex in that line is not equivalent to the one I mentioned.

尝试复制和粘贴相同的正则表达式时，它不起作用.我知道这很愚蠢，我似乎无法完全理解正则表达式.

When trying to copy and paste same regex, It doesn't work. I know this is dumb i just can't seem to fully understand regular expressions.

推荐答案

虽然有没有 regex_match() CodeIgniter 中的方法 验证库，CI用户指南中没有列出.

Though there is no regex_match() method in CodeIgniter validation library, It's not listed in the CI User Guide.

根据 @Limon 的评论:

CodeIgniter 中有一个带有管道 | 的错误，它破坏了正则表达式.

There is a bug in CodeIgniter with the pipe |, it breaks the regex.

CodeIgniter 使用| 作为验证方法之间的分隔符.

CodeIgniter uses | as a separator between validate methods.

因此，为了防止破坏正则表达式，您可以创建一个 控制器中的回调方法通过匹配正则表达式来验证输入:

Therefore, to prevent from breaking the regex, you could create a callback method in your Controller to validate the input by matching the regex:

public function regex_check($str)
{
    if (preg_match("/^(?:'[A-Za-z](([._-][A-Za-z0-9])|[A-Za-z0-9])*[a-z0-9_]*')$/", $str))
    {
        $this->form_validation->set_message('regex_check', 'The %s field is not valid!');
        return FALSE;
    }
    else
    {
        return TRUE;
    }
}

然后添加验证规则，如下:

Then add the validation rule, as follows:

$this->form_validation->set_rules('username', 'Nombre de usuario', 'required|min_length[2]|max_length[15]|callback_regex_check|is_unique[user.username]');

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