I want to find in a list of words, every words with a least 3 times the same letter in it. To achieve that I did .*(w).*1.*1.*1.*
and you can test it here http://www.regexplanet.com/advanced/java/index.html but I don’t know how to put it in my zgrep
command.
How can I insert this regex in a zgrep
command ?
Advertisement
Answer
A couple of notes:
- You do not need to match start and end of a line with
.*
since partial matches are allowed w
matches letters, digits and underscores in NFA regex patterns, in POSIX, it is safer to use[[:alnum:]_]
- To form a capturing group in a POSIX BRE pattern use escaped parentheses,
(...)
.
Thus, use
zgrep '([[:alnum:]_]).*1.*1.*1' a.gz
Or, contract it a bit since it looks a bit redundant with three consecutive .*1
subpatterns:
zgrep '([[:alnum:]_])(.*1){3}' a.gz