[英]Java's String .replaceFirst is not working and I don't know if its a bug or I did it wrong
好的,當我使用string.replace()時,我有一種替換文本的方法可以正常工作,但是當我如下圖所示切換到relpaceFirst()時,它不再有效,這是我做錯了還是錯過了?
private void acceptAccButtonActionPerformed(java.awt.event.ActionEvent evt) {
int selectedAcTableItem = validAcTable.getSelectedRow();
int selectedSugTableItem = suggestedAcTable.getSelectedRow();
if (selectedAcTableItem > 0) {
String acNameDefthmlText = htmlText;
String parensName = "";
String acName = validAcTable.getValueAt(selectedAcTableItem, 0).toString();
String acDef = validAcTable.getValueAt(selectedAcTableItem, 1).toString();
String acSent = validAcTable.getValueAt(selectedAcTableItem, 2).toString();
StringBuilder acBuilder = new StringBuilder(acDef);
acBuilder.append(" (").append(acName).append(")");
if (!acDef.equals("")) {
parensName = " (" + acName + ")";
if (htmlText.contains(acName) && !htmlText.contains(acBuilder)){
String acReplace = acBuilder.toString();
String acOrigDefName = acDefRow + parensName;
if (htmlText.contains(acOrigDefName) && parensName.contains(acOrigName)){
acNameDefthmlText = htmlText.replaceFirst(acOrigDefName, acReplace);
} else if (htmlText.contains(acName)) {
acNameDefthmlText = htmlText.replaceFirst(acName, acReplace);
}
htmlText = acNameDefthmlText;
}
validAcTable.setValueAt(true, selectedAcTableItem, 2);
Acronym acronym = createNewAcronym(acName, acSent, acDef, true);
try {
AcronymDefinitionController.sharedInstance().writeAcronymToExcelSheet(acName, acDef);
} catch (IOException ex) {
Exceptions.printStackTrace(ex);
} catch (InvalidFormatException ex) {
Exceptions.printStackTrace(ex);
}
if (validAcTable.getRowCount() - 1 >= validAcTable.getSelectedRow() + 1) {
validAcTable.changeSelection(selectedAcTableItem + 1, 0, true, true);
}
validAcTable.repaint();
}
}
如果您注意到有問題的兩種方法的簽名:
replace(char oldChar,char newChar);
replace(CharSequence target, CharSequence replacement);
replaceFirst(String regex, String replacement);
如您所見,在replaceFirst
您將匹配的參數視為regex
(正則表達式),如果參數中包含任何特殊字符,則將導致差異。
例如:考慮以下內容:
System.out.println("abcdab".replace("ab", "ef")); //<- replaces all
System.out.println("abcdab".replaceFirst("ab", "ef"));//<-replaces first
System.out.println("\\abcdab".replace("\\ab", "ef")); //<-replaces first
System.out.println("\\abcdab".replaceFirst("\\ab", "ef"));
//^ doesn't replace as `\` is an special char
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