[jboss-jira] [JBoss JIRA] Closed: (JBRULES-855) Jboss regex does not support all escape sequence

Jboss regex does not support all escape sequence ------------------------------------------------ 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: Edson Tirelli Fix For: 4.0.0.MR3 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; } }