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Shell Programming and Scripting
perl regular expressions and field search
Post 302230663 by quine on Saturday 30th of August 2008 04:01:05 PM
08-30-2008
If you want to SPLIT a line into FIELDS as you say you do in bash, then look up perl's split() built in subroutine... On the other hand, if what you really want is to test the characters from positionX to positionY, then use perl's unpack() function. Once you split out your field by delimiter or position, then you can test it using regular expressions to see if it is the string you want...
I'm not going to do ALL the work for you
I'm not going to do ALL the work for you
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LEARN ABOUT DEBIAN
algotutor
ALGOTUTOR(1) User Contributed Perl Documentation ALGOTUTOR(1) NAME
algotutor - an interactive program for observing the intermediate steps of algorithms. SYNOPSIS
algotutor [OPTION] ... DATA ... DESCRIPTION
algotutor is an interactive program for observing the intermediate steps of algorithms. The target audience is computer science students and/or anyone who studies algorithms and/or data structures. One can create data files in plain text format (actually perl anonymous hashes, but one need not care) and let algotutor runs through some predefined algorithm. Then one can step backward and forward through the execution sequence of the algorithm at different levels of details. It requires perl-Tk. DATA is the input data. For the dynamic programming algorithms such as lcs and matc, please see the respective entries in the following list; for other algorithms, it is the file name containing the actual input data. OPTIONS
-a ALGO Runs the algorithm ALGO. Currently ALGO can be one of: bst operations on binary search trees rbt operations on red-black trees (remove() is not implemented yet) heap operations on heaps -- the remove operation on a heap always removes the top element regardless of the argument sbs stack-based search on graphs, a variant of depth first search bfs breadth first search on graphs prim Prim's minimal spanning tree on graphs dijk Dijkstra's single-source shortest path on graphs flwa Floyd-Warshall's all-pair shortest path on graphs (very, very slow) dom 2-dimensional point domination graham Graham's scan for convex hull lcs longest common subsequence -- it requires two strings as the command line arguments. For example, "algotutor -a lcs AGCTATACGATGACT GTCAGTATAGTCATATG" matc optimal matrix chain multiplication -- it requires an alternating sequence of integers and matrix names as the command line arguments. For example, "algotutor -a matc 32 A 35 B 24 C 30 D 36 E 25 F 40 G 34 H 35" means finding the optimal multiplication sequence of the chain of matrices: A of size 32 by 35, B of size 35 by 24, ... H of size 34 by 35. -s VERTEX Use VERTEX as the starting vertex (for sbs, bfs, prim, and dijk) -i STEP Display step STEP as the initial image. -d FILENAME Dump the picture into FILENAME as a ps file and exit immediately without going into interactive mode. LICENSE
This code is distributed under the GNU General Public License AUTHOR
Chao-Kuei Hung ckhung AT ofset DOT org SEE ALSO
Please see /usr/share/doc/algotutor/doc/ for examples and the full set of documentations. perl v5.10.1 2010-07-05 ALGOTUTOR(1)