问题描述
我正在创建一个注册系统，需要使用 REGEX(并且更喜欢)检查名称/通行证等，到目前为止我得到的是:
I'm creating a registration system that needs to check the name/pass etc. with REGEX (and prefer to), what I've got so far is:
//Check so numbers aren't first, such as 00foobar
preg_match('/^(?!\d)[a-z0-9]+$/iD',$usrname);
//Just simple check
preg_match('/^[a-zA-Z0-9]+$/',$psword);
但是我必须在 IF 语句中做一些愚蠢的事情，例如:
But I have to do stupid things in IF statements like:
if strlen($psword) >30 ||if (strlen($psword)
如何在我的两个原始正则表达式语句中实现长度检查?这会让我很高兴..
How would I impliment the length checking in my two original regular expression statements? This would make me so happy..
推荐答案
相同，但使用 \w 和 \d 表示单词和数字，但您可能还想包含基本符号，例如 %!?/... 等...
same but using the \w and \d for word and digits, but you might want also to include basic symbols like %!?/ ... etc...
preg_match('/^[\w\d]{4,30}$/',$psword);
{n,v} 之前会验证最小 n 和最大 v 元素.
the {n,v} would validate for minimum n and maximum v elements before.
like A{2,3} 会验证 AA 和 AAA.你可以看看那里以获得更多参考
like A{2,3} would validate for AA and AAA. you can take a look there for more references
以同样的方式，如果您只想设置模式的最小值 {n,} 会这样做.例如:
On the same fashion if you want only to set the minimum of patern {n,} would do it. For example:
preg_match('/^[\w\d]{4,}$/',$psword);
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