Question

我们可以搜索“\ w \ w \ w \ d”这样的模式，它代表三个字母，后跟grep中的数字吗？它不起作用。在linux终端上有没有办法做同样的事情？

例如我想匹配'ABC9'或'NMJ6'等

Answer 1

例如：

echo ABC9 | grep -E '[[:alpha:]]{3}[[:digit:]]' -

这使用man grep定义的字符类：

   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.

Answer 2

grep -P“\ w \ w \ w \ d”

-P, --perl-regexp
Interpret PATTERN as a Perl regular expression.

Answer 3

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'

正则表达式 - Linux

3 个答案: