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Full Discussion: Regex learning.
Top Forums Shell Programming and Scripting Regex learning. Post 303043996 by nezabudka on Wednesday 12th of February 2020 09:21:02 AM
Old 02-12-2020
here is opposites \K
grep -ioP 'project\D+(?=\d+\.([\d,a-z]+\.){1,}[\d,a-z]+|\d+\.[\d,a-z]+|\d+)'

maybe means forget all follows matches?

--- Post updated at 18:18 ---

exactly means forget THIS match #positive lookahead
I'm sorry, carried away

Last edited by nezabudka; 02-12-2020 at 10:49 AM..
This User Gave Thanks to nezabudka For This Post:

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

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)

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