regex - highlight the regular expression java -

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i want highlight matching words in text using java. made application, reason code below not working. can tell me what's going on? thanks.

    pattern = pattern.compile(txt1.gettext());     matcher = pattern.matcher( ""+txtarea1.gettext());        while (matcher.find())     {         txtarea2.settext( txtarea1.gettext());     }     matcher.group();      highlighter h = txtarea2.gethighlighter();     highlightpainter painter =           new defaulthighlighter.defaulthighlightpainter(color.yellow);     int p0 = matcher.start();  int p1 = matcher.end();     try {        h.addhighlight(p0, p1, painter);    } catch (badlocationexception ex) {        logger.getlogger(re.class.getname()).log(level.severe, null, ex);    }

`

you're skipping on found text. 

while (matcher.find()) {     txtarea2.settext( txtarea1.gettext()); }

let's there match in middle of text. first time find true you'll set text on txtarea2. go top of loop , find called again. positions of start , end passed found text won't correct indexes 

int p0 = matcher.start(); int p1 = matcher.end();

in fact, tested flow , exception. here's test code:

    pattern pattern = pattern.compile("a");     matcher matcher = pattern.matcher("bbbbbbbabbbbbb");      while(matcher.find()){         system.out.println("found!");     }      system.out.println("start = " + matcher.start());     system.out.println("end = " + matcher.end());

here's output (line 23 call matcher.end())

found! exception in thread "main" java.lang.illegalstateexception: no match available     @ java.util.regex.matcher.start(matcher.java:343)     @ com.conan.faker.bar.main(bar.java:23)     @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)     @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:62)     @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43)     @ java.lang.reflect.method.invoke(method.java:483)     @ com.intellij.rt.execution.application.appmain.main(appmain.java:140)  process finished exit code 1

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