What are the basic regular expressions in Linux

This article mainly introduces what are the basic regular expressions in Linux. It is very detailed and has certain reference value. Friends who are interested must read it!

Character matching:

. Match any single character

[]: matches any single character in the specified range

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

Number of matches: used after the number of characters to specify the number of times they appear, to limit the number of times the characters precede them appear

*: match the character in front of it any number of times: 0Jet 1. Many times

. *: matches any character of any length

\?: match the preceding character 0 times or once, and the preceding character is optional

\ +: match the preceding characters one or more times, at least once

\ {m\} match the previous character m times

\ {m.n\} matches the characters preceding them at least m times and n times at most

\ {0dint n\}: no more than n times

\ {m,\}: at least m times

Position Anchor:

^: line header anchoring: for the leftmost side of the pattern

$: line end anchoring: for the rightmost side of the pattern

^ PATTERN: for PATTERN

^ $: blank line

^ [: space:]: blank lines or lines containing white space characters

Words: consecutive characters (strings) made up of non-special characters become words

\ or\ b: suffix anchoring for the right side of the word pattern

\: match the complete word

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