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| This is now an archive web site. Some is still relevant as at March 2026 but some is purely of historic interest. Lisa and I (Graham) are now fully retired from IT training.We have made many friends over 30 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Apache, Linux and Solaris/SunOS too. Our training notes are out of date, but with upward compatability some examples remain operational and relevant. You are welcome to make use of them "as seen", at your own risk. We 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 remain active, enjoying the times that we are retired but still healthy enough in mind and body to do things! I am also active in many other area and still look after a lot of web sites - you can find an index ((here)) |
Regular Expressions on a Mouse Mat *
Regular Expression Training
POSIX details * Perl details * Java details
POSIX details * Perl details * Java details
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.
Back to Regular Expression Home Page
Jump to Elements of a regular expression
| Language | Implementation Type |
|---|---|
| grep | Very basic |
| egrep | Basic |
| awk | Similar to egrep |
| sed | Basic; differs from egrep and awk |
| perl | Perl like (as you would expect) |
| java | From Java 1.4; Perl like |
| Tcl | Basic up to Tcl 8.0 POSIX from Tcl 8.1 |
| .NET | Perl like |
| MySQL | POSIX based |
| PHP | Two regex handlers One POSIX based, the other Perl based |
| Python | awk, grep egrep or emacs style |
| Ruby | Similar to Perl |
| Coldfusion | Uses POSIX character classes |
| vi and vim | egrep style |
| Hardware (Raqia / Safenet chip) | Perl based |
Back to Regular Expression Home Page
Jump to Elements of a regular expression
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