php - 编译失败 : nothing to repeat at offset 6

Question

我不确定为什么这行不通......在多个 regex 检查器和测试器中完美运行。但是当涉及到在 PHP 中运行它时，我得到了这个错误:

Warning: `preg_match()` [function.preg-match]: 
Compilation failed: nothing to repeat at offset 6 in /home/splose/public_html/index/index.php on line 49

我正在运行这个:

if(preg_match('[\\/^$.|?*+():<>]', $username)){}

Answer 1

也许你可以尝试划定你的模式？:

if(preg_match('/[\\/^$.|?*+():<>]/', $username)){}

直接取自PHP Docs :

Often used delimiters are forward slashes (/), hash signs (#) and tildes (~).