Questions tagged [regex]

Also known as regular expression or regexp, a description of a set of strings, often used for searching and validating strings.

A regex, also known as a regular expression or regexp, is a description of a set of strings with certain properties. For example, \d{5} matches a series of 5 digits, such as 43822.

Use this tag when on the hunt for scripting syntax (in perl, python, sed, grep, awk, etc.) which will match a given set of text.

1870 questions

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How to delete all lines that do NOT contain a certain word in Vim?

In vim I can delete all lines that contain the word "price" with this :g /price/d How can I delete all lines that do NOT contain the word "price"?

vim regex find-and-replace

asked Mar 31 '11 at 23:00

digitaljoel

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How to ignore certain filenames using "find"?

One of my favorite BASH commands is: find . -name '*.*' -exec grep 'SearchString' {} /dev/null \; which searches the contents of all of the files at and below the current directory for the specified SearchString. As a developer, this has come in…

bash find regex

asked Mar 05 '12 at 23:28

Cody S

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How to match digits followed by a dot using sed?

I'm trying to use sed to substitute all the patterns with digits followed immediately by a dot (such as 3., 355.) by an empty string. So I try: sed 's/\d+\.//g' file.txt But it doesn't work. Why is that?

regex sed

asked Dec 01 '12 at 21:15

Mika H.

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Removing ANSI color codes from text stream

Examining the output from perl -e 'use Term::ANSIColor; print color "white"; print "ABC\n"; print color "reset";' in a text editor (e.g., vi) shows the following: ^[[37mABC ^[[0m How would one remove the ANSI color codes from the output file? I…

regex sed perl awk

asked Jan 21 '12 at 01:01

user001

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Substitution in text file without regular expressions

I need to substitute some text inside a text file with a replacement. Usually I would do something like sed -i 's/text/replacement/g' path/to/the/file The problem is that both text and replacement are complex strings containing dashes, slashes,…

bash regex sed text-editing

asked May 09 '12 at 15:00

Andrea

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How can I search for regular expressions within webpages using Google Chrome or IE?

How can I search for regular expressions like 'foo|bar' on webpages using Google Chrome or IE? I'm aware of the "Regular Expression Searcher" extension, but it does not work for me. (Nothing happens when I hit slash.) The reviews on the web store…

google-chrome regex

asked Apr 27 '12 at 21:58

Sarah

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6 answers

use of alternation "|" in sed's regex

I am using sed, GNU sed version 4.2.1. I want to use the alternation "|" symbol in a subexpression. For example : echo "blia blib bou blf" | sed 's/bl$ia|f$//g' should return " blib bou " but it returns "blia blib bou blf". How can I have the…

regex sed

asked Feb 22 '10 at 14:31

Cedric

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Delete files with regular expression

I Tried to delete files that starts with A and ends with 2 numbers but It doesn't do a thing. What I tried: rm ^A*[0..9]2$ Where am I wrong?

bash unix regex rm

asked Feb 22 '12 at 18:07

gdoron is supporting Monica

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7 answers

Newlines in sed on Mac OS X

I find that \n doesn't work in sed under Mac OS X. Specifically, say I want to break the words separated by a single space into lines: # input foo bar I use, echo "foo bar" | sed 's/ /\n/' But the result is stupid, the \n is not…

macos mac bash regex sed

asked Jul 06 '11 at 16:01

Ivan Xiao

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11 answers

Renaming many files in Mac OS X, batch processing

I used to rename file in Linux via a rename command: rename 's/old_pattern/new_pattern/g' *glob Is there something similar in Mac OS X (Snow Leopard)?

macos command-line regex rename batch

asked Jun 15 '10 at 07:23

math

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How to run a regex search on Google Chrome or Firefox?

How can I search for expressions like 'foo|bar' on webpages using browsers like Google Chrome or Firefox?

google-chrome firefox regex

asked Feb 03 '12 at 01:55

719016

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Matching only the first occurrence in a line with Regex

I am completely new to regex and I would greatly appreciate any help. The task is simple. I have a CSV file with records that read like…

regex

asked Apr 05 '11 at 05:57

cows_eat_hay

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6 answers

Is there a linux command like mv but with regex?

For example I want to mv (.*?).sql $1.php, is there a command that lets me specify renaming patterns?

linux file-management rename regex

asked Nov 13 '09 at 18:33

JoshRibs

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How can I delete everything after the first column in Notepad++?

I'm trying to get rid of everything after a column in Notepad++. Column mode is not an option. Is it possible? What I have: 70.97.110.40 159 ms [n/a] 21 70.97.117.177 134 ms [n/a] …

script notepad++ regex

asked Aug 19 '14 at 18:06

Bob J

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5 answers

Export all regular expression matches in Textpad or Notepad++ as a list

In Textpad or Notepad++ is there an option to export all the matches for a regular expression find, as a single list? In a big text file, I am searching for tags (words enclosed in % %), using regular expression %\< and \>%, and want all the…

notepad++ regex textpad

asked Sep 20 '12 at 18:17

Kiranshell

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