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1. ³£¼ûº¯Êý
strstr($str, "abc");  
strstr($str, "abc");
2. ÕýÔòÆ¥Åä
preg_match("/(abc)/is", $str);  
preg_match("/(abc)/is", $str);
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!strstr($str, "abc");  
!strstr($str, "abc");
2. µ«ÊÇÓÃÕýÔòÄØ£¬¾ÍÖ»ÓÐÕâÑùÁË
preg_match("/^((?!abc).)*$/is", $str);  
preg_match("/^((?!abc).)*$/is", $str);
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$str = "dfadfadf765577abc55fd";  
$pattern_url = "/^((?!abc).)*$/is";  
if (preg_match($pattern_url, $str))  
{  
    echo "²»º¬ÓÐabc£¡";  
}  
else  
{  
    echo "º¬ÓÐabc£¡";  
}  
$str = "dfadfadf765577abc55fd"; $pattern_url = "/^((?!abc).)*$/is"; if (preg_match($pattern_url, $str)) { echo "²»º¬ÓÐabc£¡"; } else { echo "º¬ÓÐabc£¡"; }
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preg_match("/(abc)[^((?!xyz).)*$]/is", $str);  


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