Register a regular match followed by or preceded by a "." The Cannot register

Source: Internet
Author: User
To register a regular match followed by or preceded by a ".." The Cannot register
Username: "^\\w+$",//used for user registration. Matches a string consisting of a number, 26 letters, or underscores

UserName1: "^ (\\w+) | ([\\u4e00-\\u9fa5\\uf900-\\ufa2d]+) $ ", //For user registration, can support Chinese


To register a regular match followed by or preceded by a ".." The Cannot register

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------Solution--------------------

$p = '/^\.\.
------Solution--------------------
\.\.$/';

------Solution--------------------
You don't need regular, you can use String functions without regular

$str = ". Zh.. Ddjjdd. ";
$user _left = substr ($str, 0,2);
$user _right = substr ($str,-2);
if ($user _left = = ': ' && $user _right = = ') {
echo "Illegal user name";
} else {
echo "Legitimate user";
}
So you can
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