First, see if you even get any output with the code you first listed:
(note: i took the -o option out of egrep ... i don't have that option so it gives me an error)
If that works, try this and see if you get anything on screen:
If that works, then I want you to actually list a few real lines from input.txt so I can see what that file looks like.
I have a simple file test.out that contains data in the form of
key1=A|shift1
key2=B|shift2
key3=C|shift3
and so on.
I need to get it to print
A
B
C
I can do it using lookbehind assertion such as this
( ?<==)()
yet I was wondering if there is another way of mutching single... (8 Replies)
Hi
I have a question on regex
There is a line in a script like
my_file="$(echo SunMonTueWed | sed "s//_&g") "
My question what does the expression _&g do.
Obviously in this example the output is
_Sun_Mon_Tue_Wed
Another question can i use some trick to get the result like... (3 Replies)
Hi, im sure this is really simple but i cant quite figure it out. how do i test against a word at the beginning of the line but up to the point of a delimiter i.e. ":"
for example if i wanted to test against the user in the /etc/passwd file
peter:x:101:100:peters account:/var/peter:/bin/sh
... (3 Replies)
I have a basic question regarding * and . while using regex:
# echo 3 | grep ^*$
3
I think I understood why it outputs "3" here (because '*' matches zero or more of the previous character) but I don't understand the output of the following command:
# echo 3 | grep ^.$
#
I thought I... (7 Replies)
I have dates in mm/dd/yy format that I wish to convert to yy-mm-dd format.
()/()/() finds them, but when I try to replace with $3-$1-$2 both kate and kwrite treat it as a text literal. (2 Replies)
Hi,
I am trying to write a regex for myscript and need some input from experts.
here is what I must grep for
TICKET{Sapce}{Space}{hyphen}
so here is the example data
TICKET 34554, CT-12345, TICKET 12345: some text here
TICKET 2342, CT-12345, MA-12344: some text here
TICKET... (5 Replies)
Hi guys,
I have a file in the following format:
cmpr5551
cmpr6002
cmpr93
anne 5454
bbro 434
cmprsvc
cmprsvc7
ffgi55
vefe99
cmprsvc8
cmprsvc9
I need to "grep" only the entries which start with "cmpr" followed by the number. All other entries should be excluded.
I was trying to use... (3 Replies)
Hi guys,
I am trying to "grep" or "egrep" the following entry out of the file using regex:
MACCDB1 or MACCDB2
The problem is that the file might contain other entries which start with "MACCDB" string.
I was trying to use regex to "grep" the exact pattern but it fails to output the correct... (2 Replies)
Hi I am trying to match lines having following string
BIND dn="uid=
putting something like this is not working :
/\sBIND dn="uid=/
Any suggestion.
Thanks. John (9 Replies)
I want to match all occurrence of 01,03,05,07,10,11 at 9th and 10th position of a string .
I tried the following but its also matching characters like 33 or 11 on 9th and 10th position .
sed "/^\{8\}00/d" A.TXT
000000001000
433483433339 <<< wrong
121121211100 <<< wrong
167710000110... (10 Replies)
Discussion started by: boncuk
10 Replies
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)