蒙恩招生网 蒙恩招生网4
2023-10-30
更新时间:2023-11-07 20:05:34作者:51data
首先是特殊的Metacharacter:
. * + ^ $ \ [
注意的一点,emacs的regex可以直接用 ` ` 与 `+`.
而在 `[]` 之内 这 `] - ^` 三个是特殊字符。
. any character (but newline) * previous character or group, repeated 0 or more time + previous character or group, repeated 1 or more time previous character or group, repeated 0 or 1 time ^ start of line $ end of line [...] any character between brackets [^..] any character not in the brackets [a-z] any character between a and z \ prevents interpretation of following special char \|or \wword constituent \bword boundary \sc character with c syntax (e.g. \s- for whitespace char) \( \) start/end of group \< \> start/end of word (faulty rendering: backslash + less-than and backslash + greater-than) \_< \_> start/end of symbol \` \' start/end of buffer/string \1string matched by the first group \nstring matched by the nth group \{3\} previous character or group, repeated 3 times \{3,\} previous character or group, repeated 3 or more times \{3,6\} previous character or group, repeated 3 to 6 times \=match succeeds if it is located at point
此处要注意的是,有 or 的操作,但是要 escape 掉。
其中 * , + , and are non-greedy versions of *, +, and
另外列出语义化的semantic classes:
[:digit:] a digit, same as [0-9] [:alpha:] a letter (an alphabetic character) [:alnum:] a letter or a digit (an alphanumeric character) [:upper:] a letter in uppercase [:lower:] a letter in lowercase [:graph:] a visible character [:print:] a visible character plus the space character [:space:] a whitespace character, as defined by the syntax table, but typically [ \t\r\n\v\f], which includes the newline character [:blank:] a space or tab character [:xdigit:] an hexadecimal digit [:cntrl:] a control character [:ascii:] an ascii character [:nonascii:] any non ascii character
然后是 syntax classes:
\s- whitespace character \s/ character quote character \sw word constituent \s$ paired delimiter \s_ symbol constituent \s' expression prefix \s. punctuation character\s< comment starter \s( open delimiter character \s> comment ender\s) close delimiter character \s! generic comment delimiter \s" string quote character \s| generic string delimiter \s\ escape character
当然,这些平常也用不大着。
最后是常用的emacs-commands:
C-M-s incremental forward search matching regexp C-M-r incremental backward search matching regexp replace-regexp replace string matching regexp query-replace-regexp same, but query before each replacement align-regexp align, using strings matching regexp as delimiters highlight-regexp highlight strings matching regexp occur show lines containing a match multi-occur show lines in all buffers containing a match how-many count the number of strings matching regexp keep-linesdelete all lines except those containing matches flush-lines delete lines containing matches grep call unix grep command and put result in a buffer lgrep user-friendly interface to the grep command rgrep recursive grep dired-do-copy-regexp copy files with names matching regexp dired-do-rename-regexp rename files matching regexp find-grep-dired display files containing matches for regexp with Dired
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