I have a String(txt) and in this String is html code. I will search the String with txt.indexOf for
("< ac:structured-macro ac:macro-id=") 

and delet it with StringBuffer(sb) sb.delete(Index, EndIndex). I will do this multiple times but when i do this with a while Loop it dosen't work and find only the index of the first element("ac:structured-macro ac:macro-id=").

Edit: The Main Problem, is that the id is always diffrent and i want to delet it too.

```
String txt = textArea1.getText(); 

/*somthing like this <p>
<p>
  <br/>
</p>
<ac:structured-macro ac:macro-id="74563a55-dc09-41a1-acaa-7c6338ab4014" ac:name="unmigrated-wiki-markup" 
 ac:schema-version="1">
  <ac:plain-text-body>
    <![CDATA[
      Lorem ipsum dolor sit amet, consetetur sadipscing elitr
    ]]>
  </ac:plain-text-body>
</ac:structured-macro>
<p>
  <br/>
</p>
<ac:structured-macro ac:macro-id="bc7e6c08-82c8-4ee9-8582-b773914857f" ac:name="unmigrated-wiki-markup" 
 ac:schema-version="1">
  <ac:plain-text-body>
    <![CDATA[
      Lorem ipsum dolor sit amet, consetetur sadipscing elitr
    ]]>
  </ac:plain-text-body>
</ac:structured-macro>
*/

int StartIndexOfMacroID = 0;
int indexEndOfMacroID = 0;
StringBuffer sb = new StringBuffer(txt);

while (StartIndexOfMacroID != -1) {
       StartIndexOfMacroID = txt.indexOf("<ac:structured-macro ac:macro-id=");
       indexEndOfMacroID = StartIndexOfMacroID + 159;
       sb.delete(StartIndexOfMacroID, indexEndOfMacroID);
       System.out.println(StartIndexOfMacroID);
       );

txt = sb.toString();

System.out.println(StartIndexOfMacroID);
System.out.println(indexEndOfMacroID);

textArea2.setText(txt);

```

This is the output: 

```

17
176
159
318
Exception in thread "AWT-EventQueue-0" java.lang.StringIndexOutOfBoundsException: start -1, end 158, length 282
    at java.base/java.lang.AbstractStringBuilder.checkRangeSIOOBE(AbstractStringBuilder.java:1724)
    at java.base/java.lang.AbstractStringBuilder.delete(AbstractStringBuilder.java:863)
    at java.base/java.lang.StringBuffer.delete(StringBuffer.java:474)
    at com.company.Main$1.actionPerformed(Main.java:115)
    at java.desktop/javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1967)
    at java.desktop/javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2308)
    at java.desktop/javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:405)
    at java.desktop/javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:262)
    at java.desktop/javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:270)
    at java.desktop/java.awt.Component.processMouseEvent(Component.java:6651)
    at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3342)
    at java.desktop/java.awt.Component.processEvent(Component.java:6416)
    at java.desktop/java.awt.Container.processEvent(Container.java:2263)
    at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:5026)
    at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2321)
    at java.desktop/java.awt.Component.dispatchEvent(Component.java:4858)
    at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4918)
    at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4547)
    at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4488)
    at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2307)
    at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2772)
    at java.desktop/java.awt.Component.dispatchEvent(Component.java:4858)
    at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:778)
    at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:727)
    at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
    at java.base/java.security.AccessController.doPrivileged(Native Method)
    at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
    at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:95)
    at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:751)
    at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:749)
    at java.base/java.security.AccessController.doPrivileged(Native Method)
    at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
    at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:748)
    at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
    at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
    at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
    at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
    at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
    at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

```

Thank You for your help!