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2.1.2 Matching Control

-e pattern
--regexp=pattern

Use pattern as the pattern. This can be used to specify multiple search patterns, or to protect a pattern beginning with a ‘-’. (‘-e’ is specified by POSIX.)

-f file
--file=file

Obtain patterns from file, one per line. The empty file contains zero patterns, and therefore matches nothing. (‘-f’ is specified by POSIX.)

-i
-y
--ignore-case

Ignore case distinctions in both the pattern and the input files. ‘-y’ is an obsolete synonym that is provided for compatibility. (‘-i’ is specified by POSIX.)

-v
--invert-match

Invert the sense of matching, to select non-matching lines. (‘-v’ is specified by POSIX.)

-w
--word-regexp

Select only those lines containing matches that form whole words. The test is that the matching substring must either be at the beginning of the line, or preceded by a non-word constituent character. Similarly, it must be either at the end of the line or followed by a non-word constituent character. Word-constituent characters are letters, digits, and the underscore.

-x
--line-regexp

Select only those matches that exactly match the whole line. (‘-x’ is specified by POSIX.)


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