Newbie Regex Question

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Python Newbie Question Regex

I starting teaching myself python and am stuck on trying to understand why I am not getting the output that I want. Long story short, I am using PDB for debugging and here my function in which I am having my issue: import re ... ... ... def find_all_flvs(url): soup =...

2. Shell Programming and Scripting

What does this do (newbie question)...

I was looking through some code online and came accross this... ls *.txt | grep text1 | cat file1 – file2 | `echo wc –l` I know what "ls|grep text1" does and I know a word count gets echoed but beyond that I am confused. Please use layman terms as much as possible as I am a newbie.

3. Shell Programming and Scripting

Perl newbie - regex replace all groups issue

Hello, Although I have found similar questions, I could not find advice that could help with my problem. The issue: I am trying to replace all occurrences of a regex, but I cannot make the regex groups work together. This is a simple input test file: The Vedanta Philosophy...

4. UNIX for Dummies Questions & Answers

newbie question

Hi all, I am sure this is very simple but I cant quite get it. I am trying to search textfile1.txt for a string then take the results of the search and append the result to textfile3.txt So far I have used $ find file1.txt -exec grep "string i am looking for" '{}' \; -print this...

5. UNIX for Dummies Questions & Answers

Newbie question

Hey. i am doing a lab work for shcool I am new to using the commands. This question is give to me. I do not no the length of file nor do i know the how many charterers they are in the question. Question below "Assume that you are NOT currently in your home directory. Enter a command to copy...

6. Shell Programming and Scripting

perl newbie . &&..programming newbie (question 2)

Hello everyone, I am having to do a lot of perl scripting these days and I am learning a lot. I have this problem I want to move files from a folder and all its sub folders to one parent folder, they are all .gz files.. there is folder1\folder2\*.gz and there are about 50 folders...

7. UNIX for Dummies Questions & Answers

UNIX newbie NEWBIE question!

Hello everyone, Just started UNIX today! In our school we use solaris. I just want to know how do I setup Solaris 10 not the GUI one, the one where you have to type the commands like ECHO, ls, pwd, etc... I have windows xp and I also have vmware. I hope I am not missing anything! :p

8. UNIX for Dummies Questions & Answers

newbie question

I am taking a db classes toward oracle 10g. I am taking unix as well . I need to know what is the best option for os . should I use linux fedora. or get a sun box and start learning from there. Thanks

9. Shell Programming and Scripting

newbie question

hey all, I have repeatedly seen scripts containing the following syntax, grep "hello" $myfile >> $log 2>&1 can anyone explain exactly what "2>&1" mean? THANK YOU

10. UNIX for Dummies Questions & Answers

newbie question

hi im thinking of getting unix but i have no idea where to start I know that its an OS similar to linux but what hardware does in run on? i've heard of solaris but im not quit sure what it is thankxs

LEARN ABOUT DEBIAN

graphviz::regex

GraphViz::Regex(3pm)					User Contributed Perl Documentation				      GraphViz::Regex(3pm)

NAME

       GraphViz::Regex - Visualise a regular expression

SYNOPSIS

	 use GraphViz::Regex;

	 my $regex = '(([abcd0-9])|(foo))';

	 my $graph = GraphViz::Regex->new($regex);
	 print $graph->as_png;

DESCRIPTION

       This module attempts to visualise a Perl regular expression. Understanding regular expressions is tricky at the best of times, and regexess
       almost always evolve in ways unforseen at the start. This module aims to visualise a regex as a graph in order to make the structure clear
       and aid in understanding the regex.

       The graph visualises how the Perl regular expression engine attempts to match the regex. Simple text matches or character classes are
       represented by.box-shaped nodes. Alternations are represented by a diamond-shaped node which points to the alternations. Repetitions are
       represented by self-edges with a label of the repetition type (the nodes being repeated are pointed to be a full edge, a dotted edge points
       to what to match after the repetition). Matched patterns (such as $1, $2, etc.) are represented by a 'START $1' .. 'END $1' node pair.

       This uses the GraphViz module to draw the graph.

METHODS

   new
       This is the constructor. It takes one mandatory argument, which is a string of the regular expression to be visualised. A GraphViz object
       is returned.

	 my $graph = GraphViz::Regex->new($regex);

   as_*
       The regex can be visualised in a number of different graphical formats. Methods include as_ps, as_hpgl, as_pcl, as_mif, as_pic, as_gd,
       as_gd2, as_gif, as_jpeg, as_png, as_wbmp, as_ismap, as_imap, as_vrml, as_vtx, as_mp, as_fig, as_svg. See the GraphViz documentation for
       more information. The two most common methods are:

	 # Print out a PNG-format file
	 print $g->as_png;

	 # Print out a PostScript-format file
	 print $g->as_ps;

BUGS

       Note that this module relies on debugging information provided by Perl, and is known to fail on at least two versions of Perl: 5.005_03 and
       5.7.1. Sorry about that - please use a more recent version of Perl if you want to use this module.

AUTHOR

       Leon Brocard <acme@astray.com>

COPYRIGHT

       Copyright (C) 2000-1, Leon Brocard

       This module is free software; you can redistribute it or modify it under the same terms as Perl itself.

perl v5.14.2							    2012-04-02						      GraphViz::Regex(3pm)

UNIX for Dummies Questions & Answers