我们可以在 grep 中搜索像 "\w\w\w\d" 这样表示三个字母后跟一个数字的模式吗?它不工作。linux终端有没有办法做同样的事情?
例如我想匹配'ABC9'或'NMJ6'等
例如:
回声ABC9 | grep -E '[[:alpha:]]{3}[[:digit:]]' -
这利用了由以下定义的字符类man grep
:
Finally, certain named classes of characters are predefined
within bracket expressions, as follows. Their names are self
explanatory, and they are [:alnum:], [:alpha:], [:cntrl:],
[:digit:], [:graph:], [:lower:], [:print:], [:punct:], [:space:],
[:upper:], and [:xdigit:]. For example, [[:alnum:]] means
[0-9A-Za-z], except the latter form depends upon the C locale and
the ASCII character encoding, whereas the former is independent
of locale and character set. (Note that the brackets in these
class names are part of the symbolic names, and must be included
in addition to the brackets delimiting the bracket expression.)
Most meta-characters lose their special meaning inside bracket
expressions. To include a literal ] place it first in the list.
Similarly, to include a literal ^ place it anywhere but first.
Finally, to include a literal - place it last.
grep -P "\w\w\w\d"
-P, --perl-regexp
Interpret PATTERN as a Perl regular expression.
grep -P '\w\w\w\d'
添加 --color 使其真正脱颖而出。例如:
echo 'blahblahABC9blahblah' | grep --color -P '\w\w\w\d'