The symbols \< and \> respectively match the empty string at the beginning and end of a word. The symbol \b matches the empty string at the edge of a word, and \B matches the empty string provided it's not at the edge of a word. The symbol \w is a synonym for [_[:alnum:]]...
Linux系统里的grep命令是一种强大的文本搜索工具,它能使用正则表达式搜索文本,并把匹配的行打印出来。grep全称是Global Regular Expression Print,表示全局正则表达式版本,它的使用权限是所有用户。 grep 指令用于查找内容包含指定的字符的文件,如果发现某文件的内容符合所指定的字符,预设 grep 指令会把含有字符的那一列显...
The Backslash Character and Special Expressions The symbols \< and \> respectively match the empty string at the beginning and end of a word. The symbol \b matches the empty string at the edge of a word, and \B matches the empty string provided it's not at the edge of a word. The...
Matches the string ' wor' # (the first three letters of the first match it finds. matches the string ' wor' (' of /w{2,3}' equals ' of wor' here) 与直觉相反.下面代码中的m" "子句: $example = ' this matches a set of words and not of numbers'; $example =~ m" of(/d*)"...
$ cat demo_text 4. Vim Word Navigation You may want to do several navigation in relation to the words, such as: * e - go to the end of the current word. * E - go to the end of the current WORD. * b - go to the previous (before) word. * B - go to the previous (before...
Beginning of the string $ End of the string \ Escape special characters, e.g. \\ is "\", \+ is "+" | Alternation match. e.g. /(e|d)n/ matches "en" and "dn" • Any character, except \n or line terminator [ab]
$catdemo_text 4.VimWordNavigation Youmaywanttodoseveralnavigationinrelationtothewords,suchas: *e-gototheendofthecurrentword. *E-gototheendofthecurrentWORD. *b-gototheprevious(before)word. *B-gototheprevious(before)WORD. *w-gotothenextword. *W-gotothenextWORD. WORD-WORDconsistsofasequenceofnon...
-w, --word-regexp Select only those linescontainingmatches that formwhole words. The test is that the matching substring must either be at the beginning of the line,orpreceded(在……之前) by anon-wordconstituent(成分) character. Similarly, it must be either at the end of the lineorfollowe...
关系表达式:使用运算符进行操作,可以是字符串或数字的比较测试。 模式匹配表达式:用运算符~(匹配)和~!(不匹配); BEGIN语句块、pattern语句块、END语句块; 操作由一个或多个命令、函数、表达式组成,之间由换行符或分号隔开,并位于大括号内,主要部分是: 变量或数组赋值 输出命令 内置函数 控制流语句...
* E - go to the end of the current WORD. * b - go to the previous (before) word. * B - go to the previous (before) WORD. * w - go to the next word. * W - go to the next WORD. WORD - WORD consists of a sequence of non-blank characters, separated with white space. ...