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Java Forum / First Aid / February 2010Regular expression in Java
I am trying to create a new profile management system, and I have some regular expression I used in PHP e.g. "<\/b> (.*?) aar" Where I get the String between and aar Is there any way I can do this in Java? > I am trying to create a new profile management system, and I have some > regular expression I used in PHP e.g. "<\/b> (.*?) aar" > Where I get the String between and aar > Is there any way I can do this in Java? There's a splendid new on-line system for answering this kind of question. Visit http://www.google.com/ (that's two O's and one G, not the other way around) and enter a search for, oh, gee, I dunno, maybe "Regular expression in Java". Chances are Very Good Indeed that they'll have something you can make use of.  SignatureEric Sosman esosman@ieee-dot-org.invalid The87Boy wrote: >> I am trying to create a new profile management system, and I have some >> regular expression I used in PHP e.g. "<\/b> (.*?) aar" >> Where I get the String between and aar >> Is there any way I can do this in Java? > There's a splendid new on-line system for answering this > kind of question. Visit http://www.google.com/ (that's two O's > and one G, not the other way around) and enter a search for, oh, > gee, I dunno, maybe "Regular expression in Java". Chances are > Very Good Indeed that they'll have something you can make use of. You mean, like <http://java.sun.com/javase/6/docs/api/java/util/regex/package-frame.html> ? The API Javadocs are very useful. SignatureLew > The87Boy wrote: > >> I am trying to create a new profile management system, and I have some [quoted text clipped - 10 lines] > <http://java.sun.com/javase/6/docs/api/java/util/regex/package-frame.html> > ? Yes, but I don't know I should make use of it in my situation >>>> I am trying to create a new profile management system, and I have some >>>> regular expression I used in PHP e.g. "<\/b> (.*?) aar" >>>> Where I get the String between and aar >>>> Is there any way I can do this in Java? Yes. Eric Sosman wrote: >>> There's a splendid new on-line system for answering this >>> kind of question. Visithttp://www.google.com/(that's two O's >>> and one G, not the other way around) and enter a search for, oh, >>> gee, I dunno, maybe "Regular expression in Java". Chances are >>> Very Good Indeed that they'll have something you can make use of. Lew wrote: >> You mean, like >> <http://java.sun.com/javase/6/docs/api/java/util/regex/package-frame.html> >> ? Did you read this link? Have you read through the descriptions of the various types and methods in that package? > Yes, but I don't know I should make use of it in my situation Neither do we. You haven't seen fit to share any details. What exactly is your situation? I should think you'd make use of it in exactly parallel a way to how you use the PHP equivalent. If you can't share these details, then Eric's advice that GIYF, and reading the Javadocs, and reaching conclusions from there is really the only way to go. Have you tried this? Part of the essential skill set of the competent programmer is to reason how to use available APIs, to assemble them into the logic one wishes to embody. What is the logic you wish to embody? What are your specific questions about the Java regex libraries? What have you tried so far? What results has that achieved? Read <http://sscce.org/> GIYF. JDAYF. SignatureLew > >>>> I am trying to create a new profile management system, and I have some > >>>> regular expression I used in PHP e.g. "<\/b> (.*?) aar" [quoted text clipped - 16 lines] > Did you read this link? Have you read through the descriptions of the various > types and methods in that package? Yes I have > > Yes, but I don't know I should make use of it in my situation > > Neither do we. You haven't seen fit to share any details. What exactly is > your situation? I use the regular expression "<\/b> (.*?) aar" in PHP to get the String between the space and aar (the .*) I want to use it in the same way in Java I could of course split the String up 2 times > What are your specific questions about the Java regex libraries? Whatever it is possible to find a String from another String by a regular expression in Java > What have you tried so far? I have tried many thing, but it seems that I have to split the String >>>>>> I am trying to create a new profile management system, and I have some >>>>>> regular expression I used in PHP e.g. "<\/b> (.*?) aar" [quoted text clipped - 34 lines] > > I have tried many thing, but it seems that I have to split the String import java.util.regex.*; public class test { public static void main(String[] args) { String str = "Some where over the </b> There is a duck aar from here to there"; Pattern p = Pattern.compile("</b> (.*?) aar"); Matcher m = p.matcher(str); if (m.find()) System.out.println(m.group(1)); } } You don't have to split the string. I don't use PHP but it looks like you need to escape the forward slash? That is not required in Java. Look at Pattern and Matcher in the docs. SignatureKnute Johnson email s/nospam/knute2010/ On 3 Feb., 19:37, Knute Johnson <nos...@rabbitbrush.frazmtn.com> wrote: > >>>>>> I am trying to create a new profile management system, and I have some > >>>>>> regular expression I used in PHP e.g. "<\/b> (.*?) aar" [quoted text clipped - 53 lines] > > Look at Pattern and Matcher in the docs. Oh, it was because I have to use Matcher's group with 1 instead of 0 > You don't have to split the string. I don't use PHP but it looks like > you need to escape the forward slash? That is not required in Java. If PHP is similar to Perl, the slash indicates a regular expression, but you can change that to something else as well. One additional note. If you want to escape a special character you have to escape the escape-character in the String, so Pattern.compile("<\/b> (.*?) aar"); wouldn't work, Pattern.compile("<\\/b> (.*?) aar"); is to be used instead. Otherwise the compiler most likely complains or - even more bad - creates a wrong regex. Regards, Lothar SignatureLothar Kimmeringer E-Mail: spamfang@kimmeringer.de PGP-encrypted mails preferred (Key-ID: 0x8BC3CD81) Always remember: The answer is forty-two, there can only be wrong questions! On 3 Feb., 19:52, Lothar Kimmeringer <news200...@kimmeringer.de> wrote: > > You don't have to split the string. I don't use PHP but it looks like > > you need to escape the forward slash? That is not required in Java. [quoted text clipped - 9 lines] > is to be used instead. Otherwise the compiler most likely > complains or - even more bad - creates a wrong regex. I think the right pattern is "</b> (.*?) aar" as we are taking about the HTML-tag </b> >I am trying to create a new profile management system, and I have some >regular expression I used in PHP e.g. "<\/b> (.*?) aar" >Where I get the String between and aar >Is there any way I can do this in Java? for a quick primer in Java Regexes, see http://mindprod.com/jgloss/regex.html In Java ( .. ) capture the expression inside. .* means anything. See http://mindprod.com/jgloss/regex.html#FINDING for the code to extract the field. SignatureRoedy Green Canadian Mind Products http://mindprod.com You cant have great software without a great team, and most software teams behave like dysfunctional families. ~ Jim McCarthy On 4 Feb., 21:45, Roedy Green <see_webs...@mindprod.com.invalid> wrote: > >I am trying to create a new profile management system, and I have some > >regular expression I used in PHP e.g. "<\/b> (.*?) aar" [quoted text clipped - 4 lines] > > In Java ( .. ) capture the expression inside. .* means anything. I can't get regex this to work: </b> ((\\d)?) aar But now this works: </b> (.*?) aar Can anybody explain me why? > I can't get regex this to work: > </b> ((\\d)?) aar [quoted text clipped - 3 lines] > > Can anybody explain me why? Not until you explain what you mean by "works." Show your code, show some of the strings you're trying to match, tell us what you wanted to happen, and tell us what happened instead. SignatureEric Sosman esosman@ieee-dot-org.invalid >I can't get regex this to work: ></b> ((\\d)?) aar [quoted text clipped - 3 lines] > >Can anybody explain me why? You need to post real code since the devil is in the details. I presume your regex actually was: </b> ((\d)?) aar In Java that was Pattern.compile( "</b> ((\\d)?) aar" ); You wanted it to match: "</b> 8 aar" or "</b> aar" (2 spaces) Is this correct? SignatureRoedy Green Canadian Mind Products http://mindprod.com You cant have great software without a great team, and most software teams behave like dysfunctional families. ~ Jim McCarthy On 6 Feb., 08:26, Roedy Green <see_webs...@mindprod.com.invalid> wrote: > >I can't get regex this to work: > ></b> ((\\d)?) aar [quoted text clipped - 21 lines] > > Is this correct? Yes that is completely right the first you wrote :D >((\\d)?) you could write that as [ 0-9] Probably your problem is in the code you did not post. try composing an SSCCE. See http://mindprod.com/jgloss/sscce.html and http://mindprod.com/jgloss/regex.html for some skeletons you could use to hang your code. SignatureRoedy Green Canadian Mind Products http://mindprod.com Every compilable program in a sense works. The problem is with your unrealistic expections on what it will do. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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