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Object Orientation and General technical topics module Q801
What are Regular Expressions?
Exercises, examples and other material relating to training module Q801. This topic is presented on public courses Regular Expressions, Intermediate Python

Regular expressions are used when you want to test whether a string of text matches a particular pattern, and if it does match that pattern you want to extract elements of the match, also known as "interesting bits".

Related technical and longer articles
Pattern Matching - a primer on regular Expressions

Articles and tips on this subjectupdated
4763Regex Reference sheet
For PCRE (Perl Compatible Regular Expressions) Character classes [abcd] [^abcd] [A-J] [[:word:]] style alnum letters and digits alpha letters ascii character codes 0 - 127 blank space or tab only cntrl control characters digit decimal digits (same as \d) graph printing characters, excluding space lower lower ...
2017-10-11
(longer)
4505Regular Expressions for the petrified - in Ruby
Regular Expressions ... frighten ... newcomers at their apparent peverseness and complexity. But they need not - regular expressions are made up of just a handful of types of elements and once you realise this, they become easy! The background is that you want to ask is a string of text looks like ...
2015-06-03
 
2844Learning about Regular Expressions in C through examples
Although we more usually teach Regular Expressions on courses on Perl, Python, PHP, Ruby, etc ... there is also a standard C library, which uses the POSIX flavour of regular expressions, and I've put a short example together to "show you how". Firstly - what is a regular expression? It's a "pattern ...
2010-06-30
 
2563Efficient debugging of regular expressions
Are you a programmer? Have you ever spent *hours* looking for a very odd bug in your code that, when you find and fix it, turns out to have been so blindingly obvious that you ask "why sis it take me so LONG" ... and so does the boss! The good news is that - if the boss is a programmer - (s)he will ...
2010-01-04
 
1195Regular Express Primer
Over the years I've been teaching people about Regular Expressions, I've learnt what does and doesn't work in such tuition. A casual question I saw yesterday got me writing, and I've just posted up a new technical article to the solution centre - see here (it will open in a separate window). It's ...
2007-05-21
 
Examples from our training material
mare   Some Advanced Regular Expression handling (Perl)
Pictures
Regular Expressions - a brief history
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 [here].
Topics covered in this module
What are regular expressions?.
Why use regular expressions?.
Regular expression flavours - regular, Perl, POSIX, variants.
What are the alternatives?.
String manipulation functions.
Globbing.
Grammars.
Tokenizers.
Combinations.
Complete learning
If you are looking for a complete course and not just a information on a single subject, visit our Listing and schedule page.

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We have a technical library of over 700 books on the subjects on which we teach. These books are available for reference at our training centre.


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