[jboss-jira] [JBoss JIRA] Created: (JBRULES-855) Jboss regex does not support all escape sequence
Jboss regex does not support all escape sequence
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Key: JBRULES-855
URL: http://jira.jboss.com/jira/browse/JBRULES-855
Project: JBoss Rules
Issue Type: Bug
Security Level: Public (Everyone can see)
Affects Versions: 4.0.0.MR2
Environment: Windows XP
Reporter: Krishnan Sivaramakrishna Iyer
Assigned To: Mark Proctor
Fix For: 4.0.0.MR2
Currently, if there exists a string such as
final String version = "version 12.2";
and you try to match it against the following regex
version\\s*\\d+\\.\\d+.*
It will not match. This is because of the following problem
<tirelli> newbie: found the problem
<tirelli> it is a bug
<tirelli> but there is a workaround
<tirelli> problem is the current DRL grammar does not allow to escape things like \s
and \d
<tirelli> EscapeSequence
<tirelli> : '\\'
('b'|'t'|'n'|'f'|'r'|'\"'|'\''|'\\'|'.')
<tirelli> those are the only accepted symbols to be escaped today
<tirelli> may I ask you plz to open a JIRA requesting support to all regexp symbols?
I will fix that for 4.0 final
<tirelli> meanwhile, you can do this to work:
<tirelli> line matches "version[ \t]*[0-9]+\.[0-9]+.*"
Thanks,
Krishnan
Test case :
#created on: May 16, 2007
package com.sample
#list any import classes here.
import com.sample.Device;
import com.sample.Line;
#declare any global variables here
rule "Check for Cisco Version Exp"
when
Line ( line matches "version\\s*\\d+\\.\\d+\\.*" )
then
System.out.println("There exists a line that matches cisco version
expression.");
end
====
package com.sample;
import java.lang.String;
/**
* @author kiyer
*
*/
public class Line {
private String line;
public Line(String line) {
setLine(line);
}
/**
* @return the line
*/
public String getLine() {
return line;
}
/**
* @param line the line to set
*/
public void setLine(String line) {
this.line = line;
}
}
===
package com.sample;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.InputStreamReader;
import java.io.Reader;
import org.drools.RuleBase;
import org.drools.RuleBaseFactory;
import org.drools.compiler.PackageBuilder;
import org.drools.StatefulSession;
import org.drools.rule.Package;
/**
* This is a sample file to launch a rule package from a rule source file.
*/
public class CfiTest {
public static final void main(String[] args) {
try {
//load up the rulebase
final RuleBase ruleBase = readRule();
final StatefulSession session = ruleBase.newStatefulSession();
Line lineObj = new Line("version 12.2");
session.assertObject(lineObj);
session.fireAllRules();
session.dispose();
} catch (Throwable t) {
t.printStackTrace();
}
}
/**
* Please note that this is the "low level" rule assembly API.
*/
private static RuleBase readRule() throws Exception {
//read in the source
final Reader source = new InputStreamReader( DroolsTest.class.getResourceAsStream(
"/CfiTest.drl" ) );
//optionally read in the DSL (if you are using it).
//Reader dsl = new InputStreamReader( DroolsTest.class.getResourceAsStream(
"/mylang.dsl" ) );
//Use package builder to build up a rule package.
//An alternative lower level class called "DrlParser" can also be
used...
final PackageBuilder builder = new PackageBuilder();
//this wil parse and compile in one step
//NOTE: There are 2 methods here, the one argument one is for normal DRL.
builder.addPackageFromDrl( source );
//Use the following instead of above if you are using a DSL:
//builder.addPackageFromDrl( source, dsl );
//get the compiled package (which is serializable)
final Package pkg = builder.getPackage();
//add the package to a rulebase (deploy the rule package).
final RuleBase ruleBase = RuleBaseFactory.newRuleBase();
ruleBase.addPackage( pkg );
System.out.println("Successfully loaded the rules file.");
return ruleBase;
}
}
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