Detailed introduction to using regular expressions in Linux

This time I will bring you a detailed introduction to the use of regular expressions in Linux. What are the precautions for using regular expressions in Linux? The following is a practical case. Let’s take a look. take a look.

:

.: Matching any single character

[]: Matching any single character within the specified range;

[^]: Matches any single character outside the specified range [:digit:] lower upper alpha alnum space

Number of matches: used after the character whose number of occurrences is to be specified, used to limit the occurrence of the preceding character Number of times                                                                                                                  The preceding character is 0 or once, and the preceding character is optional

          \+: Matches the preceding character once or multiple times, at least once,

                                                                               The preceding character m times

\{m.n\} matches the preceding character at least m times, and at most n times

##                                                                                                                      apart..

#                                                                                                                                                                                                                  :space:]]: Empty lines or lines containing blank characters

Words: Continuous characters (

string

) composed of non-

special characters

become words

# \ & lt; or \ b: The first anchor, for the left side of the word mode

\ & gt; ## \ & lt; Pattern \ & GT ;: match the full word

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