egrep

all

Find patterns in files using extended `regex`es. Note: This command is an alias of `grep --extended-regexp`.

Examples (8)

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