RegEx and capturing groups

Question

hi.
i'm trying to use the capturing groups to extract substrings.
this is the data format: MTWTFSS@2005-03-19
and this my regex: Pattern.compile("((\\p{Upper}|-){7})@(19|20)\\d\\d-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])");
i want to extract the substring before the @. i have set the capturing group, but i always get an error:
java.lang.IllegalStateException: No match found
at java.util.regex.Matcher.group(Matcher.java:353)
at vdrremotecontrol.VDRTimer.(VDRTimer.java:93)
at vdrremotecontrol.VDRRemoteControl.getTimersFromVDR(VDRRemoteControl.java:628)
at vdrremotecontrol.VDRRemoteControl.loadSettings(VDRRemoteControl.java:855)
at tvbrowser.core.plugin.JavaPluginProxy.doLoadSettings(JavaPluginProxy.java:191)
... 5 more
what's the right way to set the capturing group?
greetings, henrik

Answer 1

me again :-)
// MTWTFSS@2005-03-19
Pattern repeatingAt =
tingAt =
Pattern.compile("((\\p{Upper}|-){7})@(19|20)\\d\\d-(0[
1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])");
if(dayPattern.matcher(day).matches()) {
repeating = false;
this.day_of_month = Integer.parseInt(day);
} else if(datePattern.matcher(day).matches())
tches()) {
repeating = false;
this.day_of_month =
of_month =
Integer.parseInt(datePattern.matcher(day).group(3));
} else
} else if(simpleRepeating.matcher(day).matches()) {
repeating = true;
repeating_days = determineDays(day);
} else
} else if(repeatingAtShort.matcher(day).matches())
repeating = true;
String days = day.substring(0,
bstring(0, day.indexOf("@"));
repeating_days = determineDays(days);
} else if(repeatingAt.matcher(day).matches())
tches()) {
repeating = true;
Matcher matcher =
matcher = repeatingAt.matcher(day);
System.out.println("#"+day+"#");
System.out.println(matcher.groupCount());
System.out.println(matcher.group(1));
String days = day.substring(0,
bstring(0, day.indexOf("@"));
repeating_days = determineDays(days);
}output is:
[java] #MDMDFSS@2005-06-10#
[java] 5
[java] SCHWERWIEGEND: Die Einstellungen des
n des Plugins "Video Disc Recorder" konnten nicht
geladen werden.
[java]
java]
(/home/henni/.tvbrowser/java.vdrremotecontrol.VDRRemot
eControl.prop)
[java] util.exc.TvBrowserException: Die
: Die Einstellungen des Plugins "Video Disc Recorder"
konnten nicht geladen werden.
[java]
java]
(/home/henni/.tvbrowser/java.vdrremotecontrol.VDRRemot
eControl.prop)
[java] at
a] at
tvbrowser.core.plugin.JavaPluginProxy.doLoadSettings(J
avaPluginProxy.java:197)
[java] at
a] at
tvbrowser.core.plugin.AbstractPluginProxy.loadSettings
(AbstractPluginProxy.java:114)
[java] at
a] at
tvbrowser.core.plugin.PluginProxyManager.activatePlugi
n(PluginProxyManager.java:505)
[java] at
a] at
tvbrowser.core.plugin.PluginProxyManager.activateAllPl
uginsExcept(PluginProxyManager.java:459)
[java] at
a] at
tvbrowser.core.plugin.PluginProxyManager.init(PluginPr
oxyManager.java:220)
[java] at
a] at tvbrowser.TVBrowser.main(TVBrowser.java:307)
[java] Caused by:
d by: java.lang.IllegalStateException: No match
found
[java] at
a] at
java.util.regex.Matcher.group(Matcher.java:353)
[java] at
a] at
vdrremotecontrol.VDRTimer.<init>(VDRTimer.java:94)
[java] at
a] at
vdrremotecontrol.VDRRemoteControl.getTimersFromVDR(VDR
RemoteControl.java:628)
[java] at
a] at
vdrremotecontrol.VDRRemoteControl.loadSettings(VDRRemo
teControl.java:855)
[java] at
a] at
tvbrowser.core.plugin.JavaPluginProxy.doLoadSettings(
JavaPluginProxy.java:191)
[java] ... 5
... 5
more[/cod
e][u][/u]
This example executes fine.
        String expression = "((\\p{Upper}|-){7})@(19|20)\\d\\d-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])";
        String data = "MTWTFSS@2005-03-19";
        Pattern p = Pattern.compile(expression);
        Matcher m = p.matcher(data);
        while (m.find()) {
            System.out.println(m.group(1));
        }        /Kaj