Hi: I am trying to match a string to my regular expression and then capture certain groups from the string. I know previously there is no such feature , but I am just wondering if there is one now? Basically , what am trying to do is, insert strings into the session, and carry out the reasoning to see if matches a certain regular expression. In JAVA I did it as this: public double parsingZ4_Ph_Reach(String line){ String regx="3240, Z4 Ph. Reach, .*, (.*), ohm, .*, .*, .*"; Pattern p=Pattern.compile(regx,Pattern.CASE_INSENSITIVE); Matcher m =p.matcher(line); if(m.matches()){ return Double.parseDouble(m.group(1)); } return 0; } The purpose is to extract the data in the strings using drools. Could you please give me some idea I I could do that in Drools? Many thx. -- View this message in context: http://drools.46999.n3.nabble.com/Extracting-data-from-strings-regular-ex... Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

Hi Laune: Thanks for your comments and suggestions. Actually that's what I am doing . firstly match the string in the LHS and then on the RHS I call the java method parsingZ4_Ph_Reach()--details as followed I took it as a compromised solution but not sure how it will influence the efficiency. Any idea about this? public double parsingZ4_Ph_Reach(String line){ > String regx="3240, Z4 Ph. Reach, .*, (.*), ohm, .*, > .*, .*"; > Pattern > p=Pattern.compile(regx,Pattern.CASE_INSENSITIVE); > Matcher m =p.matcher(line); > if(m.matches()){ > return Double.parseDouble(m.group(1)); > } > return 0; > } Thx ---------------------------------------------------------------------------------------------- QITENG HONG PhD Research Student Advanced Electrical Systems Group Institute of Energy and Environment Department of Electronic and Electrical Engineering University of Strathclyde Glasgow G1 1XW The University of Strathclyde is a charitable body, registered in Scotland, number SC015263 ________________________________________ From: rules-users-bounces(a)lists.jboss.org [rules-users-bounces(a)lists.jboss.org] On Behalf Of Wolfgang Laun [wolfgang.laun(a)gmail.com] Sent: 27 August 2012 17:26 To: Rules Users List Subject: Re: [rules-users] Extracting data from strings(regular expression) Although there is the "matches" operator, Drools isn't a sophisticated regular expression engine. Once you have matched a fact with a String line that matches some regular expression, you'll have to reapply the regular expression on the right hand side so that you can extract the string matching group 1. Or use simple String methods to extract this information, now that you know that the string has a certain pattern. -W On 27/08/2012, abing19881226 <q.hong(a)strath.ac.uk&gt; wrote: > Hi: > I am trying to match a string to my regular expression and then capture > certain groups from the string. > I know previously there is no such feature , but I am just wondering if > there is one now? > > Basically , what am trying to do is, insert strings into the session, > and > carry out the reasoning to see if matches a certain regular expression. > In JAVA I did it as this: > > > public double parsingZ4_Ph_Reach(String line){ > String regx="3240, Z4 Ph. Reach, .*, (.*), ohm, .*, > .*, > .*"; > Pattern > p=Pattern.compile(regx,Pattern.CASE_INSENSITIVE); > Matcher m =p.matcher(line); > if(m.matches()){ > return Double.parseDouble(m.group(1)); > } > return 0; > } > > > The purpose is to extract the data in the strings using drools. > Could you please give me some idea I I could do that in Drools? > Many thx. > > > > > > -- > View this message in context: > http://drools.46999.n3.nabble.com/Extracting-data-from-strings-regular-ex... > Sent from the Drools: User forum mailing list archive at Nabble.com. > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users