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PHP using regular expressions to verify the Chinese problem

Source: Internet
Author: User
Keywords Network programming PHP tutorial
Tags code echo failed network network programming php php tutorial programming
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str = People's Republic of China 123456789abcdefg;
echo preg_match ("/ ^ [u4e00-u9fa5_a-zA-Z0-9] {3,15}", strName);

Run this code above to see if there is any message?
Warning: preg_match (): Compilation failed: PCRE does not support L, l, N, P, p, U, u, or X at offset 3 in F: wwwrootphptest.php on line 2

It turns out that the following Perl escape sequences are not supported in PHP regular expressions: L, l, N, P, p, U, u, or X

In UTF-8 mode, "x {...}" is allowed and the curly braces are strings that represent hexadecimal numbers. The original hexadecimal escape sequence xhh matches a double-byte UTF-8 character if its value is greater than 127.
So, you can solve preg_match ("/ ^ [x80-xff_a-zA-Z0-9] {3,15}", strName);

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