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
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 …
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 …
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 - 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]'
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 …
linux - Regex (grep) for multi-line search needed - Stack Overflow
Sep 15, 2010 · $ grep -Pzo "(?s)^(\s*)\N*main.*?{.*?^\1}" *.c Explanation: -P activate perl-regexp for grep (a powerful extension of regular expressions) -z Treat the input as a set of lines, each …
Can grep output only specified groupings that match?
GNU grep has the -P option for perl-style regexes, and the -o option to print only what matches the pattern. These can be combined using look-around assertions (described under Extended …
the correct way to deal with spaces in a pattern for grep
Oct 1, 2022 · To grep literal strings as opposed to regular expressions, or in other words, to escape every regular expression operators, you can use the -F (for F ixed string) option to grep.
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 …