如何从字符串中删除所有出现的子字符串

Question

我有一个String（txt），在此String中是html代码。我将使用txt.indexOf搜索字符串以（“

并使用StringBuffer（sb）sb.delete（Index，EndIndex）删除它。我将多次执行此操作，但是当我使用while循环执行此操作时，它将无法正常工作，只能找到第一个元素的索引（“ ac：structured-macro ac：macro-id =”）。

编辑：主要问题是，id总是不同的，我也想删除它。

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);

这是输出：

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)

谢谢您的帮助！

Answer 1

基本上，问题是要删除原始字符串中所有出现的某个html标签。

在Java中，可以比您的方法所需的工作更少的精力来完成：

final String htmlContent = textArea1.getText();
final String filteredHtmlContent = htmlContent.replaceAll("<ac:structured-macro.*?</ac:structured-macro>", "");

此代码将所有出现的给定字符串替换为空字符串，等同于删除它们。
很遗憾，您发布的代码未编译。因此，没有必要分析其无法正常工作的原因。我强烈建议在将其发送到stackoverflow社区之前对其进行审查。

Answer 2

我想您只想删除标签。因为您有一些换行符

String patternText = "(<)(/)?ac:structured-macro((?!>).)*>";
Pattern pattern = Pattern.compile(patternText, Pattern.DOTALL);
String result = pattern.matcher(txt).replaceAll("");
System.out.println(result);

正则表达式说明：

标签以(<)开头。
• 您有一个开始标签和一个结束标签，因此我们需要可选的(/)?
• 接下来我们有文字ac:structured-macro
• 比我们用>搜索多行执行的所有内容((?!>).)*
• 最后，我们需要用>关闭>