c++ - QRegExp 编译时警告

Question

我正在开发一些 Qt 应用程序，其主窗口 由QPlainTextEdit 子类日志窗口 组成，用于输出事件。我有三种类型的消息:

1. 信息消息，表示一个以[INFO]子串
开头的QString
2. 警告信息，表示一个以[WARNING]子串
开头的QString
3. 错误信息，表示一个以[ERROR]子字符串开头的QString

现在，我想用 QSyntaxHighlighter 类实现的是根据消息的类型(INFO 类型 - Qt::DarkBlue 颜色，WARNING 类型 - Qt::DarkYellow 颜色，ERROR 类型 - Qt::DarkRed 颜色) 这是代码块，它应该已经完成​​了任务:

void UeLogWindowTextHighlighter::ueSetupRules()
{
    UeHighlightRule* ueRuleInfo=new UeHighlightRule(this);
    UeHighlightRule* ueRuleWarning=new UeHighlightRule(this);
    UeHighlightRule* ueRuleError=new UeHighlightRule(this);

    this->ueInfoStartExpression()->setPattern("^[INFO].\*");        // FIRST WARNING
    this->ueWarningStartExpression()->setPattern("^[WARNING].\*");  // SECOND WARNING
    this->ueErrorStartExpression()->setPattern("^[ERROR].\*");      // THIRD WARNING

    this->ueInfoExpressionCharFormat()->setForeground(Qt::darkGray);
    this->ueWarningExpressionCharFormat()->setForeground(Qt::darkYellow);
    this->ueErrorExpressionCharFormat()->setForeground(Qt::darkRed);

    ueRuleInfo->ueSetPattern(this->ueInfoStartExpression());
    ueRuleInfo->ueSetTextCharFormat(this->ueInfoExpressionCharFormat());

    this->ueHighlightRules()->append(ueRuleInfo);

    ueRuleWarning->ueSetPattern(this->ueWarningStartExpression());
    ueRuleWarning->ueSetTextCharFormat(this->ueWarningExpressionCharFormat());

    this->ueHighlightRules()->append(ueRuleWarning);

    ueRuleError->ueSetPattern(this->ueErrorStartExpression());
    ueRuleError->ueSetTextCharFormat(this->ueErrorExpressionCharFormat());

    this->ueHighlightRules()->append(ueRuleError);
}   // ueSetupRules

但是，当我编译项目时，我收到以下警告:

../../../gui/uelogwindowtexthighlighter.cpp: In member function 'void UeLogWindowTextHighlighter::ueSetupRules()': ../../../gui/uelogwindowtexthighlighter.cpp:58:47: warning: unknown escape sequence: '\*' [enabled by default]
     this->ueInfoStartExpression()->setPattern("^[INFO].\*");
                                               ^ ../../../gui/uelogwindowtexthighlighter.cpp:59:50: warning: unknown escape sequence: '\*' [enabled by default]
     this->ueWarningStartExpression()->setPattern("^[WARNING].\*");
                                                  ^ ../../../gui/uelogwindowtexthighlighter.cpp:60:48: warning: unknown escape sequence: '\*' [enabled by default]
     this->ueErrorStartExpression()->setPattern("^[ERROR].\*");
                                                ^

因此消息没有着色(这是我的怀疑)。 我的正则表达式有什么问题？我在关注this question and answer on SO .

Answer 1

Star (*) 不必转义。删除 \ 或者如果你需要 \ 它应该被转义并且 write double \ (\\)。