警告：preg_match() [function.preg-match]：未知修饰符 '(' in
当我尝试验证用户名时收到此错误消息。以下 pregexp 字符串是这样的： ^([a-zA-Z])[a-zA-Z_-]*[\w_-]*[\S]$|^([a-zA-Z] )[0-9_-]*[\S]$|^[a-zA-Z]*[\S]$^。我已经尝试了我能想到的一切，但没有任何效果。
以下是我尝试过但失败的可能解决方案：
^([a-zA-Z])[a-zA-Z_-]*[\/w_-]*[\/S]$|^([a-zA-Z])[0-9_-]*[\/S]$|^[a-zA-Z]*[\/S]$^
/^([a-zA-Z])[a-zA-Z_-]*[\/w_-]*[\/S]$|^([a-zA-Z])[0-9_-]*[\/S]$|^[a-zA-Z]*[\/S]$^/
~^([a-zA-Z])[a-zA-Z_-]*[\/w_-]*[\/S]$|^([a-zA-Z])[0-9_-]*[\/S]$|^[a-zA-Z]*[\/S]$^~
#^([a-zA-Z])[a-zA-Z_-]*[\/w_-]*[\/S]$|^([a-zA-Z])[0-9_-]*[\/S]$|^[a-zA-Z]*[\/S]$^#
我希望你能帮助我。 提前致谢。
I get this error message when I trying to validate a username. The following pregexp string is this: ^([a-zA-Z])[a-zA-Z_-]*[\w_-]*[\S]$|^([a-zA-Z])[0-9_-]*[\S]$|^[a-zA-Z]*[\S]$^. I have tried everything I can think of, but nothing works.
These are the following possible solutions I have tried, but fails:
^([a-zA-Z])[a-zA-Z_-]*[\/w_-]*[\/S]$|^([a-zA-Z])[0-9_-]*[\/S]$|^[a-zA-Z]*[\/S]$^
/^([a-zA-Z])[a-zA-Z_-]*[\/w_-]*[\/S]$|^([a-zA-Z])[0-9_-]*[\/S]$|^[a-zA-Z]*[\/S]$^/
~^([a-zA-Z])[a-zA-Z_-]*[\/w_-]*[\/S]$|^([a-zA-Z])[0-9_-]*[\/S]$|^[a-zA-Z]*[\/S]$^~
#^([a-zA-Z])[a-zA-Z_-]*[\/w_-]*[\/S]$|^([a-zA-Z])[0-9_-]*[\/S]$|^[a-zA-Z]*[\/S]$^#
I hope you can help me.
Thanks in advance.
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您的正则表达式以
^开头，因此这被解释为 分隔符。多个字符之后，您的正则表达式将在其中包含
^，并且由于它是未转义的，因此它被解释为正则表达式的模式部分的结尾。紧接着第二个
^之后，正则表达式将包含(。在 preg_match 中，结束分隔符之后的任何内容都被解释为 修饰符，并且(不是 修改。要修复它，您需要 的 PHP 手册页。
阅读有关分隔符 像这样的事情：
在您的第一个示例中，您似乎忘记添加任何分隔符，并且
^并不是作为分隔符在您添加了分隔符的后续示例中。没有告诉我们这些有什么问题是（也许它们应该是不同的问题？）。Your regular expression starts with a
^, so this is being interpreted as a delimiter.A number of characters later, your regular expression then contains a
^within it, and since this is unescaped, it is being interpreted as the end of the pattern part of the regular expression.Immediately after the second
^, your regular expression then contains a(. In preg_match, anything after the closing delimiter is interpreted as a modifier, and(is not a modifier.To fix it, you need to read the PHP manual page on delimiters.
I would assume you want something like this:
In your first example, it looks like you've forgotten to add any delimiters, and the
^was not intended as a delimiter. In the subsequent examples where you have added delimiters, you haven't told us what the problems with those are (maybe they should be different questions?).您遇到的问题是
[\/S]。这会强制用户名以S或正斜杠/结尾。您的意思是在那里写[\S]。 （尽管我不确定这样做的目的是什么。这将允许末尾有任何非空格字符。）The problem you have is with
[\/S]. This forces the usernames to end inSor a forward/slash. You meant to write[\S]there. (Albeit I'm not sure what the purpose of that is. That would allow any non-space character at the end.)