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php正则匹配为什么不成功？求助

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Jun 23, 2016 pm 02:28 PM

正则 php

if(preg_match("^[a-zA-Z][a-zA-Z0-9_\-]{5,19}$", "abc-mmm") )
echo "true";
else echo "false";

?>

想验证账号的正则表达式，字母开头，允许数字，字母，下划线，减号，6-20为，这个表达式为啥不成功啊？

Warning: preg_match() [function.preg-match]: No ending delimiter '^' found in test.php on line 3
false

试过"^[a-zA-Z][a-zA-Z0-9_-]{5,19}$"，取掉“\”也不对，求大神知道（utf8格式的）

回复讨论(解决方案)

preg_match("/^[a-zA-Z][a-zA-Z0-9_-]{5,19}$/", "ml-virgil") )

刚试过前后加" /"就行，这是为啥？我是php新手不懂，求大神指导

那个叫定界符。不加定界符的话，PHP就认定为^[a-zA-Z][a-zA-Z0-9_-]{5,19}$是字符串，而不是变量。

我们经常管"\"叫"跳脱字符"，用于转义一些特殊符号。

那个叫定界符。不加定界符的话，PHP就认定为^[a-zA-Z][a-zA-Z0-9_-]{5,19}$是字符串，而不是变量。是这样啊，那请教大神个问题，我把英文和中文用“\n”连起来存入mysql，php编码和mysql都是utf-8为啥在phpadmin中查到的是"0”，数据类型是text的？困扰我好久啊。。。

搞定了，sql语句问题，真是大意。结贴啦，谢谢

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