VOPP Tip over regular expressions

Sectie: Visual Objects
Auteur(s): Erik Visser
Publicatiedatum: 31-1-2005
Keywords: Regular Expressions, Visual Objects, VOPP
Type bijdrage: Tip
Taal: EN-en
Rating:
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Q: 

I'd like to do a seek with AND/OR in the source code, which is  currently not possible in VO itself. I understand now it should be
 possible with VOPP regular expressions, and I read in the help file:

 + (one or more)  e.g. do+g matches...

So I try for example : substr3+#E_status, selecting Reg. exp. (match case = off)
 hoping to find a line like

IF SubStr3(odbEmails:FIELDGET(#E_status),3,1)="1"

 but it does not.  What do I do I wrong?

A:
Regular expressions can be complex but are very powerful.

The example for the "+" metacharacter in the Regular Expression help says:

do+g matches a string made up of one or more "o" characters: dooog, doog,
dog match, but dg doesn't

So the "+" works in conjunction with the preceding character. Your use of
the "+" above would result in a search for strings containing one or more
threes. Now what I think you really want is to match "substr3" and
"#E_status" with any number of any characters in between. To do this you
would need:

substr3.+#E_status

This works because the "." metacharacter in Regular Expressions matches any
character and the "+" says you want one or more. (If you had wanted zero or
more you would use "*")

Full details of Regular Expressions are discussed here:
http://www.delorie.com/gnu/docs/regex/regex_toc.html

To help understand regular expressions you might try Visual RegExp:
http://laurent.riesterer.free.fr/regexp

Some info about use of Regular Expressions in various languages and .NET:
http://www.regular-expressions.info/tutorial.html

In addition to support for Regular Expressions, don't forget that VOPP will
let you search within the results of a previous search. This can be very
useful when trying to narrow down the number of matches.

--
Paul
----
Paul Piko
Piko Computing Consultants
http://www.piko.com.au
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