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Here, the array holds all matches of the regex (a quote, followed by as many non- " as possible until the next "). To do it with a single command, you could use one of: A string of text can be further defined as a single character, word, sentence or particular pattern of characters. Personally, I'd probably just do $ grep -oP '"+"' file | tr -d '"'īut that is two commands. Read Discuss Prerequisite: grep Basic Regular Expression Regular Expression provides an ability to match a string of text in a very flexible and concise manner. the second is here" as being inside quotes. And all of the quoted words are in separate lines and they are not expanded to multi lines.įirst of all, your grep -Po '"\K*' file idea fails because grep sees both "One" and ". and also my files contain nested quotes like "foo "bar" zoo". Reply to comments: It's not important for me to removing whitespace around matched pattern inside a pair of quotes, but it would be better if the command support it too. How can I achieve/print all of my patterns just using one command? In other words, it reports lines that start with any character other than and. e.g: below command grep -oP '"*"' file | grep -oP '*' The first refers to the beginning of the line, so lines with comments starting after the first character will not be excluded.

But I'm looking for one command and without using that for multiple time. I know I can do this with multiple commands combination. This means that you can use grep to check whether the input it receives matches a specified pattern. The name grep stands for global regular expression print. the second is here "Two "Īnd here are in second line " Three " "Four". Introduction The grep command is one of the most useful commands in a Linux terminal environment. For example it works if my input file contains the following: first matched is "One". What I tried, is this command: grep -Po ' "\K*' fileĪbove command works fine if I have a space before first pair of " marks. the second is here"Two "Īnd here are in second line" Three ""Four".Īs you can see all strings in output are between a pair of quotes. Let say I have a file with contents look like as following: first matched is "One". I'm trying to find all patterns between a pair of double quotes.