Exercises, examples and other material relating to training module Q801. This topic is presented on public course
Regular Expressions
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 subject | updated |
| 2844 | Learning 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 |
| 2563 | Efficient 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 |
| 1195 | Regular 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
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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.
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