正则表达式作业.docVIP

正则表达式作业 1、利用正则表达式判断字符串“Oh my love”中是否含有表达式“love”。如果含有，输出“匹配成功”。如果没有，则输出“匹配不成功”。 ?php $str=oh my love; $pattern=/love/; $aaa=array(); if (preg_match($pattern,$str,$aaa)) { echo 找到; } else echo 没找到; print_r($aaa); ? 2、查找字符串“many students have received praise”中是否含有单词“student”。如果含有，输出“匹配成功”；如果没有，则输出“匹配不成功”。 ?php $str=many students have received praise; $pattern=/student/; $aaa=array(); if (preg_match($pattern,$str,$aaa)) { echo 找到; } else echo 没找到; print_r($aaa); ? 3、分别在字符串“PHP is the web scripting language of choice”和“PHP is the website scripting language of choice”中查找是否含有单独的单词web，进行表达式匹配。 ?php $str=PHP is the web scripting language of choice; $str2=PHP is the website scripting language of choice; $pattern=/web\b/; $aaa=array(); if (preg_match($pattern,$str2,$aaa)) { echo 找到; } else echo 没找到; print_r($aaa); ? 4、查找字符串“PHP is a language,PHP is a web langage,php”中PHP出现的次数，并以数组形式输出，如果不存在则输出“PHP was not found” ?php $str=PHP is a language,PHP is a web langage,php; $pattern=/PHP/; $aaa=array(); $time=preg_match_all($pattern,$str,$aaa); if ($time0) { echo PHP共出现.$time.次; } else echo 没找到; print_r($aaa); ? 5、将字符串“The quick brown fox jumped over the lazy dog.”中的“quick”、“brown”、“fox”分别替换为“bear”、“black”、“slow”，然后将字符串逆序排列，再进行替换 ?php $str=The quick brown fox jumped over the lazy dog.; $par=array(/quick/,/brown/,/fox/); $par1=array(/bear/,/black/,/slow/); $rep=array(bear,black,slow); $rep1=array(quick,brown,fox); $str3=array(); echo $str2=preg_replace($par,$rep,$str); echo br; $str3=split( ,$str2); print_r($str3); krsort($str3);//将数组元素反序排列 echo br; print_r($str3); function rcat($v,$w) { $v.=$w; $v.= ; return $v; } $end=array_reduce($str3,rcat); echo br; print_r($end); echo br; echo $str2=preg_replace($par1,$rep1,$str); ? 6、利用正则表达式匹配“b标题: /bdiv align=center21世纪展望/div”，内容按格式输出到浏览器上，再将题目改为“历史回顾”。 ?php $str=b标题: /bdiv align=center21世纪展望/div; $str1=b标题: /bdiv align=center历史回顾/div; if (preg_match(/([a-