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For 2023 - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))

Where can I use Regular Expressions?
Regular expressions can be used in a wide variety of languages, but they're implemented slightly differently every time. There are two groupings - the regular expressions that use the POSIX standard, and the others that are Perl like - but that does NOT mean that a one Perl-like implementation will be identical to another Perl-like implementation. The most basic stuff always applies, but it's the extensions that differ.

LanguageImplementation Type
grepVery basic
awkSimilar to egrep
sedBasic; differs from egrep and awk
perlPerl like (as you would expect)
javaFrom Java 1.4; Perl like
TclBasic up to Tcl 8.0
POSIX from Tcl 8.1
.NETPerl like
PHPTwo regex handlers
One POSIX based, the other Perl based
Pythonawk, grep egrep or emacs style
RubySimilar to Perl
ColdfusionUses POSIX character classes
vi and vimegrep style
(Raqia / Safenet chip)
Perl based

Back to Regular Expression Home Page
Jump to Elements of a regular expression

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