我试着想出一个正则表达式,它可以与反勾的内部匹配,也可以是1或3。`(.*?)````(.*?)```(|```)(.*?)(=`)
But that creates too many match groups, I've tried `$` and `^`, but those seems to be start of a line and
我需要检测一个命令在它的一个子命令中是否有sudo命令,到目前为止,我有这样的命令: // this regex is not perfect but work
$separators = "/(?:\"[^\"\\\\]*(?:\\\\[\S\s][^\"\\\\]*)*\"|'[^'\\\\]*(?:\\\\[\S\s][^'\\\\]*)*')(*SKIP)(*F)|(\s+(?:&&|\|{1,2}|
我有一个问题,匹配卷曲引号,在UTF-8编码文本(小说,从项目古腾堡下载)。我不难把引号用直撇号(')括起来,但当引号用卷曲引号括起来时,我似乎找不到它们。我试图使用utf8ToInt()找到整数等效的值,但它返回了NA的卷曲标记。hardtimes<-readLines(con="http://www.gutenberg.org/files/786/786-0.txt",encoding="UTF-8")
tmp<-hardtimes[368] #sample line wi