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正则表达式中的特殊字符

正则表达式中常用的特殊字符包括： 1. ^ : 匹配输入字符串的开始位置 2. $ : 匹配输入字符串的结束位置 3. . : 匹配除换行符外的任意字符 4. * : 匹配前面的字符零个或多个 5. + : 匹配前面的字符一次或多次 6. ? : 匹配前面的字符零次或一次 7. [] : 匹配字符集中的任意一个字符 8. [^] : 匹配不在字符集中的任意一个字符 9. () : 分组，可以使用 | 或者 () 来构造复杂的正则表达式 10. \ : 转义字符，可以将特殊字符转义为普通字符以上是常见的特殊字符，不同的编程语言和正则表达式引擎可能会有略微的差异。

Public @ 2023-04-25 19:00:14

域名cname解析使用方法

威海网站建设威海域名
3340

CNAME解析是指将一个域名别名（Canonical Name Record）指向另一个域名上的解析记录的过程。具体步骤如下： 1. 在域名管理后台添加CNAME记录：登录域名管理后台，找到DNS解析管理界面，在相应位置添加一条CNAME记录，填入相关参数：主机记录（@或www），记录类型（CNAME），解析线路（默认或其他），记录值（目标域名）等。 2. 等待解析生效：提交记录后，需要等待一

Public @ 2023-06-16 15:50:31

网站设计

网站的结构和导航设置应该注意什么？每个网页都需要有合适的标题，网站首页标题建议使用站点名称或者站点代表的公司、机构名称；其余的内容页面，标题建议做成与正文内容的提炼和概括，建议格式“页面标题_站点名称”，这可以让您的潜在用户通过搜索引擎结果中的标题快速访问到您的页面。充分利用网站首页或者频道首页的 description 标签，提供此网页内容的概括说明，形式为<meta name="

Public @ 2020-07-03 15:45:10

揭开正则表达式的神秘面纱

[原创文章，转载请保留或注明出处：http://www.regexlab.com/zh/regref.htm]引言正则表达式（regular expression）描述了一种字符串匹配的模式，可以用来：（1）检查一个串中是否含有符合某个规则的子串，并且可以得到这个子串；（2）根据匹配规则对字符串进行灵活的替换操作。正则表达式学习起来其实是很简单的，不多的几个较为抽象的概念也很容易理解。之所以很多人

Public @ 2012-07-07 16:14:31

经典正则表达式

1. 匹配数字：\d 2. 匹配非数字：\D 3. 匹配字母：[a-zA-Z] 4. 匹配非字母：[^a-zA-Z] 5. 匹配单词字符：\w 6. 匹配非单词字符：\W 7. 匹配空格：\s 8. 匹配非空格：\S 9. 匹配换行符：\n 10. 匹配回车符：\r 11. 匹配制表符：\t 12. 匹配任意字符：. 13. 匹配0或多个：* 14. 匹配1或多个：+ 15. 匹配0或1个：？ 1

Public @ 2023-04-23 04:50:09

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[ DB ] CONNECT:[ UseTime:0.024798s ] mysql:dbname=briline.net;host=106.14.77.182;port=3306;charset=utf8
[ SQL ] SHOW COLUMNS FROM `ob_article` [ RunTime:0.018383s ]
[ SQL ] SELECT * FROM `ob_article` WHERE `id` = 7751 LIMIT 1 [ RunTime:0.016716s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'const', 'possible_keys' => 'PRIMARY', 'key' => 'PRIMARY', 'key_len' => '4', 'ref' => 'const', 'rows' => 1, 'extra' => NULL, ) ]
[ SQL ] select * from `ob_article_tongji` where category_id=12 and mark_type='cate' order by times desc limit 15 [ RunTime:0.017295s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article_tongji', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 608, 'extra' => 'Using where; Using filesort', ) ]
[ SQL ] select * from `ob_article_tongji` where category_id=12 and mark_type='tags' order by times desc limit 100 [ RunTime:0.017222s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article_tongji', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 608, 'extra' => 'Using where; Using filesort', ) ]
[ SQL ] select * from `ob_article_tongji` where category_id=12 and mark_type='tags' order by rand() limit 30 [ RunTime:0.017739s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article_tongji', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 608, 'extra' => 'Using where; Using temporary; Using filesort', ) ]
[ SQL ] SELECT * FROM `ob_article` WHERE `id` = 7751 LIMIT 1 [ RunTime:0.016652s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'const', 'possible_keys' => 'PRIMARY', 'key' => 'PRIMARY', 'key_len' => '4', 'ref' => 'const', 'rows' => 1, 'extra' => NULL, ) ]
[ SQL ] update `ob_article` set views=views+2 where id=7751 [ RunTime:0.017438s ]
[ SQL ] SELECT COUNT(*) AS tp_count FROM `ob_article` WHERE `category_id` = 12 AND `cate` = '威海网站建设' AND `status` <> -1 LIMIT 1 [ RunTime:0.025510s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 9541, 'extra' => 'Using where', ) ]
[ SQL ] SELECT * FROM `ob_article` WHERE `category_id` = 12 AND `cate` = '威海网站建设' AND `status` <> -1 ORDER BY rand() LIMIT 0,2 [ RunTime:0.045533s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 9541, 'extra' => 'Using where; Using temporary; Using filesort', ) ]
[ SQL ] SELECT COUNT(*) AS tp_count FROM `ob_article` WHERE `category_id` = 12 AND `tags` = '威海正则表达式' AND `status` <> -1 LIMIT 1 [ RunTime:0.023802s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 9541, 'extra' => 'Using where', ) ]
[ SQL ] SELECT * FROM `ob_article` WHERE `category_id` = 12 AND `tags` = '威海正则表达式' AND `status` <> -1 ORDER BY rand() LIMIT 0,2 [ RunTime:0.048964s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 9541, 'extra' => 'Using where; Using temporary; Using filesort', ) ]

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