When grep stops after NUM matching lines, it outputs any trailing context lines. When the -c or --count option is also used, grep does not output a count greater than NUM. When the -v or --invert-match option is also used, grep stops after outputting NUM non-matching lines. -o,...
var str="a123ccad"; var n=str.match(/[a][a-z-1-9]/);//与var n=str.match(/[a][a-z-1-9]/m); console.log(n) 输出结果: ["a1", index: 0, input: "a123ccad", groups: undefined] var str="a123ccad"; var n=str.match(/[a][a-z-1-9]/g); console.log(n) 输出结果:...
-q, --quiet, --silent Quiet; do not write anything to standard output. Exit immediately with zero status if any match is found, even if an error was detected. Also see the-sor--no-messagesoption. (-q is specified by POSIX.) 专门适合编写脚本? -s, --no-messages Suppresserror messages...
-q, --quiet, --silent Quiet; do not write anything to standard output. Exit immediately with zero status if any match is found, even if an error was detected. 即,-q 选项指定不打印任何内容到标准输出,即使遇到错误也不打印,只会返回命令执行的结果,如果匹配返回 0,否则返回非 0 值。 可以用 ...
grep - print lines matching a patterngrep [OPTIONS] PATTERN [FILE...] grep [OPTIONS] [-e PATTERN | -f FILE] [FILE...]
--include=FILE_PATTERN search only files that match FILE_PATTERN --exclude=FILE_PATTERN skip files and directories matching FILE_PATTERN --exclude-from=FILE skip files matching any file pattern from FILE --exclude-dir=PATTERN directories that match PATTERN will be skipped. ...
When grep stops after NUM matching lines, it outputs any trailing context lines. When the -c or --count option is also used, grep does not output a count greater than NUM. When the -v or --invert-match option is also used, grep stops after outputting NUM non-matching lines. -o, ...
To interactively view the contents of main.cpp and search it, where -y shows any nonmatching lines as context:ug -Q -y main.cpp To interactively search main.cpp, starting with the search pattern TODO and a match context of 5 lines (context can be interactively enabled and disabled, this ...
nms <- nms[is.na(match(nms, c("F","T")))]# <-- work around "checking hack"aa <- sapply(nms,function(.) { o <- get(.)if(is.function(o)) names(formals(o)) }) iw <- sapply(aa,function(a) any(grepl(pattern, a, ignore.case=TRUE))) ...
Match the exact string that the Nth subexpression did . (Dot) match any single character [charset] Match any member of the set charset (see below) c Match any nonspecial character \c Match literal c. The character may not be (, ), {, }, or any digit from 1 through 9. The \ ...