1.+
\nh+\u662f\u81f3\u5c11\u5305\u542b\u4e00\u4e2ah
\n\/ph+p\/
\nphhhhhp\u662f\u5339\u914d\u7684<\/p>\n
2.*
\nh*\u5305\u542b0\u4e2a\u6216\u591a\u4e2ah
\n\/ph*p\/
\nphhhhhp \u548c pp \u90fd\u662f\u5339\u914d\u7684 ,\u4f46\u662f\u524d\u5bfc\u5b57\u7b26\u4e0d\u80fd\u66f4\u6539.\u6bd4\u5982pop\u5c31\u4e0d\u5339\u914d<\/p>\n
3.?
\nh? 0\u4e2a\u6216\u80051\u4e2ah
\nphhhhhp \u548c pp \u90fd\u662f\u5339\u914d\u7684<\/p>\n
4..
\np.p \u5339\u914d\u4efb\u610f\u4e00\u4e2a\u5b57\u7b26.\u6bcf\u4e2a.\u4ee3\u8868\u4e00\u4e2a\u5b57\u7b26
\nphp\u662f\u5339\u914d\u7684<\/p>\n
5..*
\n.* \u524d\u5bfc\u4efb\u610f\u5b57\u7b260\u4e2a\u6216\u591a\u4e2a
\np.*p
\npikjsdhiufkujushdifp \u5339\u914d<\/p>\n
6.{x}
\nph{3}p \u524d\u5bfc\u5fc5\u987b\u662f3\u4e2a
\nphhhp \u5339\u914d<\/p>\n
6.{x,y}
\nph{3,5}p \u524d\u5bfc\u5fc5\u987b\u662f3-5\u4e2a
\nphhhp \u5339\u914d phhhhhp \u4e5f\u5339\u914d<\/p>\n
6.{x,}
\nph{3,}p \u524d\u5bfc\u5fc5\u987b\u81f3\u5c113\u4e2a
\nphhhp \u5339\u914d \u65e0\u8bba\u591a\u5c11\u4e2ah\u90fd\u884c<\/p>\n
7.$
\nphp$ \u4e00\u822c\u52a0\u5728\u6a21\u5f0f\u5c3e\u90e8.\u8868\u793a\u4ece\u5c3e\u90e8\u5f00\u59cb\u5339\u914d \u793a\u4f8b\u5fc5\u987b\u4ee5php\u4e3a\u7ed3\u5c3e
\nkjsadhsfjkiashfaphp \u662f\u5339\u914d\u7684<\/p>\n
8.^
\n^php \u4e00\u822c\u52a0\u5728\u6a21\u5f0f\u5934\u90e8.\u8868\u793a\u4ece\u5934\u90e8\u5f00\u59cb\u5339\u914d \u793a\u4f8b\u5fc5\u987b\u4ee5php\u4e3a\u5f00\u5934
\nphpkjsadhsfjkiashfa \u662f\u5339\u914d\u7684<\/p>\n
9.|
\nphp|asp \u9009\u62e9\u7b26\u53f7,\u5de6\u53f3\u5176\u4e2d\u4e00\u4e2a\u5b58\u5728\u5373\u53ef\u5339\u914d
\nphp asp \u90fd\u80fd\u5339\u914d<\/p>\n
\u5143\u5b57\u7b26
\n1. [a-z] [A-Z] [0-9] [a-zA-Z0-9] [a-zA-Z0-9_]
\n\u4e2d\u62ec\u53f7\u4e2d,\u4efb\u610f\u4e00\u4e2a\u6ee1\u8db3,\u5373\u4e3a\u5339\u914d<\/p>\n
2. [^abc]
\n\u4e0d\u662f\u5728\u5f00\u5934\u5339\u914d\u7684^,\u800c\u662f\u4e2d\u62ec\u53f7\u91cc\u7684^, \u5c31\u662f\u9664\u4e86\u4e2d\u62ec\u53f7\u4e2d\u7684\u4efb\u610f\u5b57\u7b26\u4e3a\u5339\u914d
\nd\u4e3a\u5339\u914d<\/p>\n
3.\\w
\n\u4e3a\u4e86\u8ba9\u4eba\u4eec\u66f4\u65b9\u4fbf \\w\u4ee3\u8868 [a-zA-Z0-9_]<\/p>\n
3.\\W
\n\u4e3a\u4e86\u8ba9\u4eba\u4eec\u66f4\u65b9\u4fbf \\W\u4ee3\u8868 [^a-zA-Z0-9_]<\/p>\n
4. \\d \u7b49\u540c\u4e8e[0-9] \\D \u7b49\u540c\u4e8e[^0-9]<\/p>\n
5. \\b
\nphp\\b\u662f\u5426\u5230\u5355\u8bcd\u8fb9\u754c
\nphp\u5339\u914d php is good \u5339\u914d phpp\u4e0d\u5339\u914d<\/p>\n
6.\\
\nphp\\+p \u5339\u914d\u6b63\u5219\u4e2d\u7684\u7279\u6b8a\u5b57\u7b26. \u6bd4\u5982+\u662f\u7279\u6b8a\u5b57\u7b26.\u4f46\u662f\u4f60\u8981\u5339\u914d
\nphp+p\u5339\u914d<\/p>\n
\u4fee\u9970\u7b26.\u4e00\u822c\u653e\u5728\/\/\u7684\u5916\u9762
\n1.i \u5b8c\u6210\u4e0d\u533a\u5206\u5927\u5c0f\u5199\u7684\u641c\u7d22
\n\/php\/i
\nPHP php\u90fd\u662f\u5339\u914d\u7684<\/p>\n
2.m \u591a\u884c\u8bc6\u522b\u7684\u65f6\u5019\u8bc6\u522b\u884c\u5c3e\u7528, \u627f\u8ba4\\n\u6362\u884c\u7b26\u4e3a\u7ed3\u5c3e
\n\/php\/m
\n“This is php\\n,is good”\u662f\u5339\u914d\u7684<\/p>\n
3.\u5ffd\u7565\u89c4\u5219\u6a21\u5f0f\u6b63\u5219\u4e2d\u7684\u7a7a\u767d\u5b57\u7b26
\n\/ph p\/x
\nphp\u662f\u5339\u914d\u7684<\/p>\n
4.A
\n\/php\/A \u5fc5\u987b\u4ece\u5934\u5f00\u59cb\u5339\u914d\u540c^,\u5fc5\u987b\u4e3aphp\u5f00\u5934
\nphpsadijuhsefjiksdf \u662f\u5339\u914d\u7684<\/p>\n
5.U
\n\u7981\u6b62\u8d2a\u5a6a<\/p>\n
preg\u5bb6\u65cf\u51fd\u6570<\/p>\n
1.preg_grep() \u641c\u7d22\u6570\u7ec4\u4e2d\u6240\u6709\u5143\u7d20,\u8fd4\u8d27\u6709\u4e0e\u67d0\u4e2a\u5339\u914d\u7684\u6240\u6709\u5143\u7d20\u7ec4\u6210\u7684\u6570\u7ec4
\n$mode=’\/p$\/’;
\n$language=array(“php”,”asp”,”jsp”,”python”,”ruby”);
\n$arr=preg_grep($mode,$language);
\nprint_r($arr);
\n\u7ed3\u679c:
\nArray
\n(
\n[0] => php
\n[1] => asp
\n[2] => jsp
\n)<\/p>\n
2.preg_match() \u641c\u7d22\u6a21\u5f0f,\u76f4\u63a5\u8fd4\u56de\u771f\u6216\u8005\u5047 1,0
\necho preg_match(‘\/php[1-6]\/’,’php7′);
\n\u7ed3\u679c:
\n0
\n———————————–
\n\u7535\u5b50\u90ae\u4ef6\u7684\u5c0f\u6848\u4f8b:
\n$mode=’\/^([\\w\\.]{2,255})@([\\w\\-]{1,255}).([a-z]{2,4})$\/’;
\n$string=”sangco@163.com”;
\nif(preg_match($mode,$string)){
\necho “\u7535\u5b50\u90ae\u4ef6\u5408\u6cd5!”;
\n}else{
\necho “\u7535\u5b50\u90ae\u4ef6\u4e0d\u5408\u6cd5!”;
\n}<\/p>\n
3.preg_match_all() \u5b57\u7b26\u4e32\u4e2d\u641c\u7d22\u6240\u6709\u51fa\u73b0,\u5e76\u653e\u5165\u6570\u7ec4
\n$mode=’\/php[1-6]\/’;
\n$string=”php5asjhgdasdphp4ahsjdguywephp3ndfsbfhdphp2″;
\npreg_match_all($mode,$string,$out);
\nprint_r($out);
\n\u7ed3\u679c:
\nArray
\n(
\n[0] => Array
\n(
\n[0] => php5
\n[1] => php4
\n[2] => php3
\n[3] => php2
\n)
\n}<\/p>\n
4.preg_quote() \u7279\u6b8a\u5b57\u7b26\u524d\u52a0 “\\” \u4e00\u822c\u6ca1\u5565\u7528<\/p>\n
5.preg_replace() \u641c\u7d22\u5339\u914d\u7684\u7ed3\u679c,\u7136\u540e\u66ff\u6362\u6389
\necho preg_replace(“\/php[1-6]\/”,’python’,”This is a php5,This is a php4″);
\n———————————–
\n\u5c0f\u6848\u4f8b:
\n$mode=’\/\\[b\\](.*)\\[\\\/b\\]\/U’; \/\/U\u4e3a\u7981\u6b62\u8d2a\u5a6a, \u5339\u914d\u6700\u8fd1\u7684\u5b57\u7b26
\n$replace = ‘<strong>\\1<\/strong>’; \/\/\u53d6\u7b2c\u4e00\u7ec4\u5339\u914d
\n$string = “This is a [b]php5[\/b],This is a [b]php4[\/b]”;
\necho preg_replace($mode,$replace,$string);
\n\u7ed3\u679c:
\nThis is a <strong>php5<\/strong>,This is a <strong>php4<\/strong><\/p>\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
1.+ h+\u662f\u81f3\u5c11\u5305\u542b\u4e00\u4e2ah \/ph+p\/ phhhhhp\u662f\u5339\u914d\u7684 2.* h*\u5305\u542b0\u4e2a\u6216\u591a\u4e2ah \/ph*p\/ phhhhhp \u548c pp \u90fd\u662f\u5339\u914d\u7684 ,\u4f46\u662f\u524d\u5bfc\u5b57\u7b26\u4e0d\u80fd\u66f4\u6539.\u6bd4\u5982pop\u5c31\u4e0d\u5339\u914d 3.? h? 0\u4e2a\u6216\u80051\u4e2ah phhhhhp …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"topic":[],"class_list":["post-127","post","type-post","status-publish","format-standard","hentry","category-php"],"_links":{"self":[{"href":"https:\/\/www.sangco.cn\/index.php?rest_route=\/wp\/v2\/posts\/127","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.sangco.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.sangco.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.sangco.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.sangco.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=127"}],"version-history":[{"count":1,"href":"https:\/\/www.sangco.cn\/index.php?rest_route=\/wp\/v2\/posts\/127\/revisions"}],"predecessor-version":[{"id":128,"href":"https:\/\/www.sangco.cn\/index.php?rest_route=\/wp\/v2\/posts\/127\/revisions\/128"}],"wp:attachment":[{"href":"https:\/\/www.sangco.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=127"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.sangco.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=127"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.sangco.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=127"},{"taxonomy":"topic","embeddable":true,"href":"https:\/\/www.sangco.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftopic&post=127"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}