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Mon, 14 July 2014 21:11

Messages: 21
Registered: May 2014

Junior Member

Hi,

I want to use a the matches function to check if a string matches a regex.

If a call the matches method in a single expression, it works.

" a ".matches(".*[a-zA-Z].*")

But if I use it in an select expression, it does not work and the result is empty.

select(x | x.matches(".*[a-zA-Z].*"))

I printed the contents of the collection and there are String matching the regex.

What am I doing wrong?

Greetings, Mario

Mon, 14 July 2014 21:17

Messages: 2163
Registered: July 2009
Location: York, UK

Senior Member

Hi Mario,

Could you please share a minimal example [1] we can use to reproduce this?

Cheers,
Dimitris

[1] http://www.eclipse.org/epsilon/doc/articles/minimal-examples/

Mon, 14 July 2014 21:30

Messages: 21
Registered: May 2014

Junior Member

Hi Dimitris,

var set = new Sequence();
set.add(" a");
set = set.select(x|x.matches((".*[a-zA-Z].*")));

works. There is one entry in the set.

but

var set = new Sequence();
set.add(" a\r");
set = set.select(x|x.matches((".*[a-zA-Z].*")));

Does not work. There is no entry in the set.

There seems to be a problem with the \r.

Do you know why?

Greetings, Mario

Mon, 14 July 2014 21:42

Messages: 21
Registered: May 2014

Junior Member

The regex should be:

(?s).*[a-zA-Z].*

With (?s) the dot operator also recognizes linebreaks as a charater.
This is called single-line mode

see

http://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html#DOTALL

[Updated on: Tue, 15 July 2014 12:45]

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