The test is that the matching substring must either be at the beginning of the line, or preceded by a non-word constituent character.
Select only those lines containing matches that form whole words. Invert the sense of matching, to select non-matching lines. This option is useful for passing to shell scripts that already use -i, to cancel its effects because the two options override each other. no-ignore-caseĭo not ignore case distinctions in patterns and input data. Ignore case distinctions in patterns and input data, so that characters that differ only in case match each other. The empty file contains zero patterns, and therefore matches nothing. If this option is used multiple times or is combined with the -e ( - -regexp) option, search for all patterns given. This option can be used to protect a pattern beginning with “-”. If this option is used multiple times or is combined with the -f ( - -file) option, search for all patterns given. Matching Control -e PATTERNS, - -regexp= PATTERNS This option is experimental when combined with the -z ( - -null-data) option, and grep -P may warn of unimplemented features. Interpret I as Perl-compatible regular expressions (PCREs). Interpret PATTERNS as basic regular expressions (BREs, see below). Interpret PATTERNS as fixed strings, not regular expressions.
Interpret PATTERNS as extended regular expressions (EREs, see below). Output the version number of grep and exit.
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