android - How to resolve IndexOutOfBounds exception when using matcher.find()? -


my app stops if no match found. piece of code:

while (matcher.find()) {    tagvalues.add(matcher.group(1));    }

how can show user there no match , still on same page? logcat. gives indexoutofbounds exception.

java.lang.indexoutofboundsexception: invalid index 0, size 0 04-16 21:17:56.700: e/androidruntime(19492):    @ java.util.arraylist.throwindexoutofboundsexception(arraylist.java:255) 04-16 21:17:56.700: e/androidruntime(19492):    @ java.util.arraylist.get(arraylist.java:308) 04-16 21:17:56.700: e/androidruntime(19492):    @ com.approve.smsapp.conversation$1.onitemclick(conversation.java:115) 04-16 21:17:56.700: e/androidruntime(19492):    @ android.widget.adapterview.performitemclick(adapterview.java:299) 04-16 21:17:56.700: e/androidruntime(19492):    @ android.widget.abslistview.performitemclick(abslistview.java:1113) 04-16 21:17:56.700: e/androidruntime(19492):    @ android.widget.abslistview$performclick.run(abslistview.java:2904) 04-16 21:17:56.700: e/androidruntime(19492):    @ android.widget.abslistview$3.run(abslistview.java:3638)

please add more code better understand problem. see below simple example of matcher, may you:

public class regextestpatternmatcher {   public static final string example_test = "this small example string i'm going use pattern matching.";    public static void main(string[] args) {     pattern pattern = pattern.compile("\\w+");     // in case ignore case sensitivity,     // use statement:     // pattern pattern = pattern.compile("\\s+", pattern.case_insensitive);     matcher matcher = pattern.matcher(example_test);     // check occurance     while (matcher.find()) {       system.out.print("start index: " + matcher.start());       system.out.print(" end index: " + matcher.end() + " ");       system.out.println(matcher.group());     }     // create new pattern , matcher replace whitespace tabs     pattern replace = pattern.compile("\\s+");     matcher matcher2 = replace.matcher(example_test);     system.out.println(matcher2.replaceall("\t"));   } }

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