asp.net (C#)

目录...................................................................................................................................................2 引言...................................................................................................................................................1 什么是正则表达式？.......................................................................................................................1 准备工作...........................................................................................................................................1 匹配单个字符...................................................................................................................................1 1.匹配固定单个字符...............................................................................................................1 2.匹配任意单个字符...............................................................................................................2 3.匹配“.”元字符.................................................................................................................3 4.匹配字符组...........................................................................................................................4 4.1 字符组的基本语法...................................................................................................4 4.2 在字符组中使用字符区间.......................................................................................5 4.3 反义字符组...............................................................................................................6 5.匹配特殊字符.......................................................................................................................7 5.1 匹配元字符...............................................................................................................7 5.2 匹配空字符...............................................................................................................8 5.3 匹配特定字符类型...................................................................................................9 5.3.1 匹配数字类型.................................................................................................9 5.3.2 匹配字母、数字、下划线.............................................................................9 5.3.3 匹配空字符...................................................................................................10 匹配多个字符.................................................................................................................................10 1.匹配一个或多个.................................................................................................................11 2.匹配零个或多个字符.........................................................................................................12 3.匹配零个或一个字符串.....................................................................................................13 4.匹配指定数目字符.............................................................................................................14 4.1 匹配固定数目的字符.............................................................................................14 4.2 匹配区间以内数目的字符.....................................................................................15 5.贪婪匹配和惰性匹配.........................................................................................................16 5.1 贪婪匹配、惰性匹配概述.....................................................................................16 5.2 贪婪匹配的匹配过程：.........................................................................................17 5.3 惰性匹配的匹配过程.............................................................................................17 5.4 值得注意的两个匹配模式.....................................................................................18 匹配边界.........................................................................................................................................19 1.匹配单词边界.....................................................................................................................19 2.边界及其相对性.................................................................................................................21 2.1 边界的定义.............................................................................................................21 2.2 边界的相对性.........................................................................................................22 3.匹配非单词边界.................................................................................................................23 3.匹配文本边界.....................................................................................................................24 3.1匹配文本首..............................................................................................................24 3.2匹配文本末..............................................................................................................25 匹配子模式.....................................................................................................................................26 1.子模式..................................................................................................................................26 2.“或”匹配.........................................................................................................................27 3.在子模式中使用“或”匹配.............................................................................................27 4.嵌套子模式.........................................................................................................................28 后向引用.........................................................................................................................................29 1.理解后向引用.....................................................................................................................29 2.后向引用的一个常见应用.................................................................................................32 3. .Net中的后向引用...........................................................................................................33 文本替换.........................................................................................................................................33 1.使用后向引用进行文本替换.............................................................................................33 1.1 高亮显示文本.........................................................................................................34 1.2 替换电话号码格式.................................................................................................34 2. .Net 中的文本替换.........................................................................................................35 预查和非获取匹配.........................................................................................................................35 1.理解非获取匹配.................................................................................................................35 2.正向预查.............................................................................................................................37 3.反向预查.............................................................................................................................39 4.正向、反向预查组合.........................................................................................................40 5.负正向预查、负反向预查.................................................................................................41 5.1 负正向预查.............................................................................................................41 5.2 负反向预查.............................................................................................................41 总结.................................................................................................................................................42

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