In this example, pa*ttern is the regex pattern you want to match. The*metacharacter after the character a allows for zero or more occurrences of the preceding character (a). So, this command will match strings like “pttern”, “patern”, “paatern”, and “pattern” in the file. Esc...
grep [options] regex [file...] //grep命令的格式,在参数选项之后是一个regex(正则表达式) 1. -i忽略大小写(–ignore-case) -l查找匹配项的文件名,不是文本行本身(–files-with-matches) -L跟-l 参数相反,查找不包含匹配项的文件名(–files-without-match) grep -i you 1.txt //虽然不太被注意,但...
The scanning will stop on the first match. -l, --files-with-matches Suppress normal output; instead print the name of each input file from which output would normally have been printed. The scanning will stop on the first match. -m NUM, --max-count=NUM Stop reading a file after ...
你也可以通过--invert-match选项来输出所有没有匹配到的行: 代码语言:javascript 复制 $ grep--invert-match \--ignore-casegnu gpl-3.0.txt Version3,29June2007Copyright(C)2007Free Software Foundation,Inc.<http://fsf.org/>[...648lines...]Public License insteadofthisLicense.But first,please read ...
正则表达式:Regular Expression, REGEX 由一类特殊字符及文本字符所编写的模式,其有些字符不表示其字面意义,而是用于表示控制或通配的功能; 正则表达式可分为两类: 1,基本正则表达式:BRE(Basic Regular Expression) 1)元字符: .:表示匹配任意单个字符 使用示例: ...
reti) { /* RegExp Match */ stk_printseq2(stdout, seq, UINT_MAX); } else if (reti != REG_NOMATCH) { /* RegExp Error */ regerror(reti, ®ex, msgbuf, sizeof(msgbuf)); fprintf(stderr, "Regex match failed: %s\n", msgbuf); regerr = 1; break; } } kseq_destroy(seq); /...
#grep [option] [regex pattern] [path] In this syntax Let's understand each parameter in detail. The grep command options By default, grep searches the specified pattern line by line in the specified location. If it finds any match in any line, it prints that line at the terminal. For...
awk '/regex/{print (x=="" ? "match on line 1" : x)};{x=$0}' 打印匹配正则表达式的后一行,但是不打印当前行: awk '/regex/{getline;print}' 以任何顺序查找包含 AAA、BBB 和 CCC 的行: awk '/AAA/; /BBB/; /CCC/' 以指定顺序查找包含 AAA、BBB 和 CCC 的行: ...
[:print:] 可打印字符 [:punct:] 标点符号 (2)演示 2.2.2 配置次数 (1)格式 * 匹配前面的字符任意次,包括0次,贪婪模式:尽可能长的匹配 .* 任意长度的任意字符,不包括0次 \? 匹配其前面的字符0 或 1次 \+ 匹配其前面的字符至少1次 \{n\} 匹配前面的字符n次 ...
Use fixed strings for patterns (don’t interpret pattern as a regex). -n --line-number Prefix the line number to matching lines. --column Prefix the 1-indexed byte-offset of the first match from the start of the matching line.