bash - Capturing Groups From a Grep RegEx - Stack Overflow
The first capture group is stored in index 1, the second (if any) in index 2, etc. Index zero is the full match. side note #1 regarding regex anchors: You should be aware that without anchors, this …
regex - How to find patterns across multiple lines using grep?
Apr 22, 2010 · Grep is an awkward tool for this operation. pcregrep which is found in most of the modern Linux systems can be used as
regex - Negative matching using grep (match lines that do not …
How do I match all lines not matching a particular pattern using grep? I tried this: grep '[^foo]'
regex - Using the star sign in grep - Stack Overflow
Jul 6, 2016 · The expression you tried, like those that work on the shell command line in Linux for instance, is called a "glob". Glob expressions are not full regular expressions, which is what …
Grep: how to add an "OR" condition? - Unix & Linux Stack Exchange
Dec 1, 2011 · How can I introduce a conditional OR into grep? Something like, grepping a file's type for (JPEG OR JPG), and then sending only those files into the photos folder. For …
Can grep show only words that match search pattern?
Oct 10, 2009 · Is there a way to make grep output "words" from files that match the search expression? If I want to find all the instances of, say, "th" in a number of …
linux - Regex (grep) for multi-line search needed - Stack Overflow
Sep 15, 2010 · Regex (grep) for multi-line search needed [duplicate] Asked 15 years, 3 months ago Modified 2 years, 1 month ago Viewed 317k times
Grep for beginning and end of line? - Stack Overflow
Jan 24, 2016 · The tricky part is a regex that includes a dash as one of the valid characters in a character class. The dash has to come immediately after the start for a (normal) character …
How to run grep with multiple AND patterns? - Unix & Linux Stack …
Mar 25, 2016 · I would like to get the multi pattern match with implicit AND between patterns, i.e. equivalent to running several greps in a sequence: grep pattern1 | grep pattern2 | ... So how to …
How do you extract IP addresses from files using a regex in a linux ...
0 Everyone here is using really long-handed regular expressions but actually understanding the regex of POSIX will allow you to use a small grep command like this for printing IP addresses.