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EVL validation error [message #674320]

Thu, 26 May 2011 13:50

lalakis

Messages: 48
Registered: October 2009

Member

I'd like to apply a regular expression to a rule by evl.i typed:
constraint A{
check : self.attribute.isDefined() and self.attribute.asString().matches('\w*:\w*')

message : 'Empty attribute is not allowed at '+self.Name + ' component'
}

but i am getting an error while i am typing the rule at the line where the chech rule is defined.How can i apply regular expressions with matches function?

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Re: EVL validation error [message #674329 is a reply to message #674320]

Thu, 26 May 2011 14:21

lalakis

Messages: 48
Registered: October 2009

Member

I realized that the problem remaines whenever a star is included at re regexp

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Re: EVL validation error [message #674391 is a reply to message #674329]

Thu, 26 May 2011 18:08

Louis Rose

Messages: 440
Registered: July 2009
Location: York, United Kingdom

Senior Member

Hi,

Backslash is the escape character in EOL strings. A backslash literal is represented with '\\'.

The following EOL code:

'abc:def'.isColonWithPrefixAndOrSuffix().println();

':'.isColonWithPrefixAndOrSuffix().println();
'abc:'.isColonWithPrefixAndOrSuffix().println();
':def'.isColonWithPrefixAndOrSuffix().println();

'abc'.isColonWithPrefixAndOrSuffix().println();

operation String isColonWithPrefixAndOrSuffix() : Boolean {
	return self.matches('\\w*:\\w*');
}

Prints true for the first four statements, and false for the fifth statement. Note that the argument to matches uses two backslashes to represent each backslash literal.

Cheers,
Louis.

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