ããPHP使ç¨æ£å表达å¼æåå符串ä¸å°æ¬å·<>ãå°æ¬å·()ãä¸æ¬å·[]ã大æ¬å·{}ä¸çå符示ä¾,éè¦çæåå¯ä»¥åèä¸
ããå¤å¶ä»£ç 代ç å¦ä¸:
ãã$str="ä½ å¥½<æ>(ç±)[å京]{天å®é¨}";
ããecho f1($str); //è¿åä½ å¥½
ããecho f2($str); //è¿åæ
ããecho f3($str); //è¿åç±
ããecho f4($str); //è¿åå京
ããecho f5($str); //è¿å天å®é¨
ããfunction f1($str)
ãã{
ãã$result = array();
ããpreg_match_all("/^(.*)(?:<)/i",$str, $result);
ããreturn $result[1][0];
ãã}
ããfunction f2($str)
ãã{
ãã$result = array();
ããpreg_match_all("/(?:<)(.*)(?:>)/i",$str, $result);
ããreturn $result[1][0];
ãã}
ããfunction f3($str)
ãã{
ãã$result = array();
ããpreg_match_all("/(?:\()(.*)(?:\))/i",$str, $result);
ããreturn $result[1][0];
ãã}
ããfunction f4($str)
ãã{
ãã$result = array();
ããpreg_match_all("/(?:\[)(.*)(?:\])/i",$str, $result);
ããreturn $result[1][0];
ãã}
ããfunction f5($str)
ãã{
ãã$result = array();
ããpreg_match_all("/(?:\{)(.*)(?:\})/i",$str, $result);
ããreturn $result[1][0];
ãã}
ããPSï¼ (?:å符) 表示ä¸æè·è¿ä¸ªå符ãè²ä¼¼PHPä¸æ¯æå°å符æ¢ææ¬å·ã
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ããPS2ï¼ç¯è§ï¼(?!) (?=) (?<!) (?<=)
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