[rules-users] mvel regex not working???
Carlsen, Len
len.carlsen at ubc.ca
Thu Nov 15 19:29:01 EST 2007
Thanks a lot Edson. I had escaped characters that don't need to be
escaped which works in Java but not in mvel (error: no viable
alternative at character '\').
Java: "^[a-zA-Z0-9\\#]$"
mvel: "^[a-zA-Z0-9#]$"
Len
________________________________
From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Edson Tirelli
Sent: Thursday, November 15, 2007 7:47 AM
To: Rules Users List
Subject: Re: [rules-users] mvel regex not working???
Len,
When you use code inside eval(), it is executed in the chosen dialect
(default is java). So, the regexp of your first rule is parsed and
executed in java and is correct.
When you use code outside eval(), it is parsed by the Drools parser
and the drools parser do not require the extra '\' to escape
escape-codes. See the examples bellow:
java: "^[a-zA-Z0-9\\!\\#\\$\\%\\&]"
equivalent drools regexp: "^[a-zA-Z0-9\!\#\$\%\&]"
If you change your regexp to use single '\' instead of double, it
should work fine.
[]s
Edson
2007/11/14, Carlsen, Len <len.carlsen at ubc.ca>:
Hi,
I have an email validation regex where the mvel matches doesn't seem to
work. I have created 2 rules where test1 uses the Java String matches
and test2 uses the mvel matches. Test1 works but test2 doesn't. I am
using Drools 4.0.3 and JDK 1.6.0_02.
rule "Test1"
when
// This works
email : String()
eval( !email. matches(
"^[a-zA-Z0-9\\!\\#\\$\\%\\&\\'\\*\\+\\-\\/\\=\\?\\^\\_\\`\\{\\|\\}\\~]+(
\\.[a-zA-Z0-9\\!\\#\\$\\%\\&\\'\\*\\+\\-\\/\\=\\?\\^\\_\\`\\{\\|\\}\\~]+
)*@[a-zA-Z0-9]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(\\.[a-zA-Z0-9]([a-zA-Z0-9
-]{0,61}[a-zA-Z0-9])?)*\\.[a-zA-Z]{2,6}$" ) )
then
System.out.println( "1-Invalid Email Address: " + email );
end
rule "Test2"
when
// This doesn't work
email : String( toString not matches
"^[a-zA-Z0-9\\!\\#\\$\\%\\&\\'\\*\\+\\-\\/\\=\\?\\^\\_\\`\\{\\|\\}\\~]+(
\\.[a-zA-Z0-9\\!\\#\\$\\%\\&\\'\\*\\+\\-\\/\\=\\?\\^\\_\\`\\{\\|\\}\\~]+
)*@[a-zA-Z0-9]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(\\.[a-zA-Z0-9]([a-zA-Z0-9
-]{0,61}[a-zA-Z0-9])?)*\\.[a-zA-Z]{2,6}$" )
then
System.out.println( "2-Invalid Email Address: " + email );
end
Here's the output using email addresses x.x at x.com (valid) and x.xx.com
(invalid):
test1-Invalid Email Address: x.xx.com
test2-Invalid Email Address: x.x at x.com
test2-Invalid Email Address: x.xx.com
The regex expressions are exactly the same. Am I doing something wrong
here?
Thanks,
Len
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Edson Tirelli
Software Engineer - JBoss Rules Core Developer
Office: +55 11 3529-6000
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