Regex 正则表达式-Linux

我们可以搜索像“\w\w\w\d”这样的模式吗？它在grep中表示三个字母后跟一个数字？它不起作用。在linux终端上有没有同样的方法

例如，我想匹配'ABC9'或'NMJ6'等

grep-p“\w\w\d”

添加颜色，使其真正脱颖而出。 例如：

echo 'blahblahABC9blahblah' | grep --color -P '\w\w\w\d'

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

echo 'blahblahABC9blahblah' | grep --color -P '\w\w\w\d'

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

---

给我们一个你想要匹配的字符串的例子。

   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.