AppletTalk.com Java discussions newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  pattern matching help on logical OR          AppletTalk.com Forum Index -> Java Help View previous topic :: View next topic   Author Message Shawna Guest Posted: Thu May 26, 2005 7:53 pm    Post subject: pattern matching help on logical OR I'm using Java 1.4.2_05 and need some help getting a logical OR to work within my pattern matcher. I'm trying to get both string A and B to be recognized by one pattern? String strA = "04/14:03,blahblahblahu007F"; String strB = "04/14:03,blahblahblah"; So I'm trying to match: Two numerals followed by slash followed by 2 numerals followed by a colon followed by 2 numerals followed by a comma followed by anything followed by a one or 0 delete character OR the end of the line/string. Here is the regex: Pattern.compile("[0-9]{2}[u002F][0-9]{2}[u003A][0-9]{2}[u002C].+[u007F?]|[$]", Pattern.DOTALL); The logical OR doesn't work though. And I've tried the OR a few other ways as well. .... [u007F|$] .... [u007F?|$] .... [u007f]?|[$] These don't work either. I'd appreciate any suggestions. Thanks, Shawna Back to top John C. Bollinger Guest Posted: Thu May 26, 2005 8:51 pm    Post subject: Re: pattern matching help on logical OR Shawna wrote: Quote: I'm using Java 1.4.2_05 and need some help getting a logical OR to work within my pattern matcher. I'm trying to get both string A and B to be recognized by one pattern? String strA = "04/14:03,blahblahblahu007F"; String strB = "04/14:03,blahblahblah"; So I'm trying to match: Two numerals followed by slash followed by 2 numerals followed by a colon followed by 2 numerals followed by a comma followed by anything followed by a one or 0 delete character OR the end of the line/string. So how is the end of the String special in this regard? What is difference between the case where there is no u007f and when you want to match end-of-input? The two specific strings you provided are both matched by this pattern: "[0-9]{2}/[0-9]{2}:[0-9]{2},.+\u007f?" (without necessity of any regex options). Are there other strings that need to be matched by the pattern but aren't? Quote: Here is the regex: Pattern.compile("[0-9]{2}[u002F][0-9]{2}[u003A][0-9]{2}[u002C].+[u007F?]|[$]", Pattern.DOTALL); The logical OR doesn't work though. And I've tried the OR a few other ways as well. ... [u007F|$] ... [u007F?|$] ... [u007f]?|[$] These don't work either. When you put the $ in a character class, it represents a literal '$' character, not end-of-input / end-of-line. It is unlikely in your case that you need to explicitly look for end-of-line at all. You may find this regex testing tool useful: http://www.fileformat.info/tool/regex.htm -- John Bollinger [email]jobollin (AT) indiana (DOT) edu[/email] Back to top Shawna Guest Posted: Fri May 27, 2005 4:16 am    Post subject: Re: pattern matching help on logical OR Thanks John. An alarm is coming in from some switch equipment via a modem. My stuff reads the characters from on a socket. Usually the alarms are terminated with a delete character, but not always. So I'm looking for some sort of end of string as well as the delete. However, in the cases without a delete, I may have to just have to rely on a time-out. Shawna Back to top John C. Bollinger Guest Posted: Fri May 27, 2005 2:59 pm    Post subject: Re: pattern matching help on logical OR Shawna wrote: Quote: Thanks John. An alarm is coming in from some switch equipment via a modem. My stuff reads the characters from on a socket. Usually the alarms are terminated with a delete character, but not always. So I'm looking for some sort of end of string as well as the delete. However, in the cases without a delete, I may have to just have to rely on a time-out. By the time you match the String against the pattern you must have already parsed it from the input, so the question of matching a message boundary is at a lower level. Are you saying, though, that when there is a delete character in the input, you can tolerate other, unspecified data afterward? You could write that into the pattern, but it might be more appropriate to look into the differences in behavior between Matcher.matches(), Matcher.lookingAt(), and Matcher.find(). One of the latter two may serve your purpose better than the first. Also, I didn't previously say so, but you probably want to construct an explict Pattern object and use Matchers based on it, rather than using String.matches(). Not only does doing so give you more flexibility, but if you hold on to the Pattern object and reuse it then you also save the work of parsing the pattern string for every match attempt. -- John Bollinger [email]jobollin (AT) indiana (DOT) edu[/email] Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         AppletTalk.com Forum Index -> Java Help All times are GMT Page 1 of 1   Jump to: Select a forum Java Newsgroups----------------Java DiscussionsWeb-based java games comp.lang.java 3D Graphics API's for Java Java: Support and criticism Java System Announcements comp.lang.java.api JavaBeans Java and CORBA Java and Databases comp.lang.java.developer Java GUI Toolkits Java Help comp.lang.java.javascript JVM, native methods and hardware comp.lang.java.misc Java Language Programming Security and Java comp.lang.java.setup Java Software Tools comp.lang.java.tech ibm.software.java.linux  Non-English Java Newsgroups----------------Java Language (German)Language Java (Français)Java (Italian)  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.