Can anyone suggest a regex pattern that matches 4 consecutive lines of text?

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I am trying to parse a large data file. In the file there are groups of either 3 or 4 lines of data separated by a blank line. Eg:

Data Group One Name
Data Group One Datum 1
Data Group One Datum 2
Data Group One Datum 3

Data Group Two Name
Data Group Two Datum 1
Data Group Two Datum 2

Data Group Three Name
Data Group Three Datum 1
Data Group Three Datum 2
Data Group Three Datum 3

I am looking for a quick way to extract all groups of data that have 4-lines (ignoring all of the 3-line groups). Is there a way with regex to find all groups of 4-lines in a text file? Or any other suggested (perhaps something using awk or sed) methods to do this?

Not really pretty but this should work:




Basically, you're looking for one or more non-new-line characters, then a new line, one or more non-new-line character, then a new line, etc.

EDIT: Fixed my regex, it matched for blocks of more than 4 lines. I added a negative lookahead for another line of text.

Understanding SGML and XML Tools: Practical programs for handling , Can anyone suggest a regex pattern that matches 4 consecutive lines of text? regular expression examples regex tutorial python regex regexp matlab javascript  Hi all, I wish to extract certain string based on fixed pattern of the input String I am providing and for this I am using Matches activity of Uipath. The problem I am facing is while extracting data from multiple lines. My Input String looks like below: 28 - Country - Germany (DE) 83 - Location - F 709, Ludwigshafen, Germany 448 - Building - F 709 449 - Floor - EG 450 - Room - 3 461 - Remark

I haven't tested it, but this should work for an awk script:

#!/bin/awk -f
        count = 0;
        lines = "";
    if ($0 != "") {
        lines = lines \n $0;
    } else if (count == 4) {
        print lines;       
    if ($0 == "") {
        count = 0;
        lines = "";

New Perspectives on XML, Comprehensive, Practical programs for handling structured text Peter Flynn often case-​insensitive; the Regular Expression matches the attribute name ID followed it won't match anything if the attribute and its value are split over two lines, on consecutive lines, and are usually employed to change one pattern of characters into another. In addition (OR) select blank lines. That’s as much as I can get from your text. But if there are som spaces or something different, just update data, so we can update pattern to match it. For complete technical explanation or pattern insert expression on this page Regex101.

You could work around line break characters - pseudo code example:

\n\n 1-or-more-characters \n 1-or-more-characters \n 1-or-more-characters \n 1-or-more-characters \n\n

Everything you need to know about Regular Expressions, Figure F-2 describes the regular expression symbols for these character types. non-word characters \s a white space character (a blank space, tab, new line, To match any occurrence of a single digit, you use the regular expression /\d/ This matches three consecutive digits: /\d\d\d/ and thus would match text strings​  World's simplest browser-based utility for extracting regex matches from text. Load your text in the input form on the left, enter the regex below and you'll instantly get text that matches the given regex in the output area. Powerful, free, and fast. Load text – get all regexp matches. Created by developers from team Browserling.


this will capture 1 line, 2 lines and 3 lines.

this is greedy matches.

if you need 3 or 4 lines you can use:


or you can use:


I have tested it in

[PDF] Regular Expressions: The Complete Tutorial, On an abstract level a regular expression, regex for short… I'd recommend you open in another window or tab and experiment If you need to match a line break, they usually come in one of two flavors: Consecutive characters can be included in a character class as ranges using the  1. Regular Expression Basic Syntax. 1.1 Common Characters. Letters, numbers, the underline, and punctuations with no special definition are "common characters". When regular expression matches a string, a common character can match the same character.

Sed match everything between two patterns, A regular expression (regex or regexp for short) is a special text string for expression (replace the first \b with ^ and the last one with $) can be used by a In just one line of code, whether that code is written in Perl, A "match" is the piece of text, or sequence of bytes or characters that pattern was consecutive dots. I'm writing a raw XML rule and I need to find blocks of text in device config files that are delimited by two consecutive lines at the beginning of the block and two consecutive lines at the end of the block. Is is possible to use multi-line regular expression patterns in the block-start and block-e

Match regular expression (case sensitive), For example, if the regular expression is foo and the input String is foo, the match will I need a command line method to replace the text between the patterns, If two remote patterns can match same character(s) as well as the characters ADDRESS Defines a set of consecutive lines Format: start-addr,end-addr Dec 19,​  While erjoalgo's answer is correct, according to the Emacs Wiki Mutliline Regex page, it is not the most efficient answer:. To match any number of characters, use this: .* – the problem is that . matches any character except newline.

14 Strings, For example, if outkey is 'match' , then regexp returns the substrings that match the You can include any of the inputs and request any of the outputs from Since regexp returns matchStr as a cell array containing text that has multiple lines, you '..ain' matches sequences of five consecutive characters that end with 'ain' . Can only suggest you put the top pattern or first line number you want to match first without further info. You could ask a question with details of your use case :) – Zanna Mar 31 '19 at 7:57 @Zanna, "Can only suggest you put the top pattern or first line number you want to match first without further info".