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For 2021 - online Python 3 training - see ((here)).

Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.

Please ask about private 'maintenance' training for Python 2, Tcl, Perl, PHP, Lua, etc.

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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