This time I will bring you a detailed introduction to the use ofregular expressionsin Linux. What are theprecautionsfor 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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