DOT-Files/Gentoo/gentooamd/home/user/.tldrc/tldr/pages/common/egrep.md

egrep

Find patterns in files using extended regexes. Note: This command is an alias of grep --extended-regexp. More information: https://manned.org/egrep.

• Search for one or more repeated characters:

egrep '{{a}}+' {{path/to/file}}

• Search for zero or one occurrences of a character (optional match):

egrep '{{a}}?' {{path/to/file}}

• Search for 10 repetitions of a character:

egrep '{{a}}{10}' {{path/to/file}}

• Search for 3 to 7 repetitions of a character:

egrep '{{a}}{3,7}' {{path/to/file}}

• Search for one of the listed options:

egrep '{{cat}}|{{dog}}|{{mouse}}' {{path/to/file}}

• Search for one of the listed options inside a larger pattern:

egrep 'c({{a}}|{{o}}|{{u}})p' {{path/to/file}}

• Search for a group of characters repeating one or more times:

egrep '({{aeiou}})+' {{path/to/file}}

• Search using standard character classes (more info: https://www.regular-expressions.info/posixbrackets.html):

egrep [[{{:alnum:|:alpha:|:space:|...}}]] {{path/to/file}}