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@lists.jboss.org [mailto:rules-users-bounces@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@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@x.com (valid) and x.xx.com (invalid):

test1-Invalid Email Address: x.xx.com

test2-Invalid Email Address: x.x@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
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