Perl - Data Munging

Perl module P669

Data Munging

Exercises, examples and other material relating to training module P669. This topic is presented on public course Perl for Larger Projects

Perl for Larger Projects - training course - Objects, huge data, SQL databases, XML, efficiency and other topics.

Perl for Larger Projects - Objects, huge data, SQL databases, XML, efficiency and other topics. This advanced course takes the Perl programmer through ...

http://www.wellho.net/course/plfull.html [course]

Storing a regular expression in a perl variable

When you match to a regular expression in a perl program, the program has to compile the regular expression (i.e. work out what it does) before actually ...

http://www.wellho.net/mouth/597_Stor ... iable.html [short article]

Filtering and altering Perl lists with grep and map

In Perl, you can process whole lists (arrays) in single operations - and that's very efficient at run time as it avoids the needs for loops, and the needed ...

http://www.wellho.net/mouth/1316_Fil ... d-map.html [short article]

Data Monging

div class= introsubheads PROCESSING LARGE QUANTITIES OF DATA BR /div Data Monging is a term that has come to be used for processing quantities of ...

http://www.wellho.net/solutions/perl-data-monging.html [longer article]

Perl substitute - the e modifier

Here's a graphic illustration of the use of the "e" for "execute" modifier used on the end of substitute operation in Perl. The "s" for substitute allows ...

http://www.wellho.net/mouth/1947_Per ... ifier.html [short article]

Extracting information from a file of records

Here's a very common application ... You file a file of data records, and you want to parse the file handing the data record by record. Each record ...

http://www.wellho.net/mouth/1509_Ext ... cords.html [short article]

Nothing beats Perl to solve a data manipulation requirement quickly

OK - I admit it. It might be slightly out of fashion but I still love Perl for that quick hack script which is a one-off data manipulation need. I have ...

http://www.wellho.net/mouth/2129_Not ... ickly.html [short article]

Perl is a superb language for data manipulation. This module covers some of the more advanced features of the language which help give it this capability.

This topic is presented on public course Perl for Larger Projects

Examples from our training material

anagram	Perl program to look for anagrams
filedata	List manipulation - sorting files by size and reporting largest 10
filedata2	Sorting files by size - shortened example, harder to follow?
memsave	Compressing data to save memory
new1	List iteration
new2	Alternative list iteration
oldfash	Handling an "arraY" - really a list - the oldfashioned way
pc1	(Somewhat) conventional programming methods to parse data
pc2	Using the power of lists to save code and time
pc3	Handling a file as a single string of text

Pictures

Examining the output of a Perl program

Background information

Some modules are available for download as a sample of our material or under an Open Training Notes License for free download from http://www.training-notes.co.uk.

Topics covered in this module

Iterating over data in Perl.
Processing data through regular expressions.
Compressing data.

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