Question

我正在处理子类QSyntaxHighlighter：

UeSyntaxHiglighter::UeSyntaxHiglighter(QTextDocument* const parent)
    : QSyntaxHighlighter(parent)
{
    UeHighlightRule ruleInfo;
    UeHighlightRule ruleWarning;
    UeHighlightRule ruleError;
    UeHighlightRule ruleIPv4Address;
    UeHighlightRule rulePortNumber;
    UeHighlightRule ruleProtocolCommand;
    UeHighlightRule ruleProtocolCommandAcknowledge;

    QTextCharFormat ruleInfoFormat;
    QTextCharFormat ruleWarningFormat;
    QTextCharFormat ruleErrorFormat;;
    QTextCharFormat ruleIPv4AddressFormat;
    QTextCharFormat ruleProtocolCommandFormat;
    QTextCharFormat ruleProtocolCommandAcknowledgeFormat;

    ruleInfoFormat.setForeground(Qt::darkBlue);
    ruleInfoFormat.setFontWeight(QFont::ExtraLight);
    ruleInfo.pattern=QRegExp("^\\[INFO\\].*");
    ruleInfo.format=ruleInfoFormat;

    ruleWarningFormat.setForeground(Qt::darkYellow);
    ruleWarningFormat.setFontWeight(QFont::Normal);
    ruleWarning.pattern=QRegExp("^\\[WARNING\\].*");
    ruleWarning.format=ruleWarningFormat;

    ruleErrorFormat.setForeground(Qt::darkRed);
    ruleErrorFormat.setFontWeight(QFont::ExtraBold);
    ruleError.pattern=QRegExp("^\\[ERROR\\].*");
    ruleError.format=ruleErrorFormat;

    ruleIPv4AddressFormat.setFontWeight(QFont::ExtraBold);
    ruleIPv4Address.pattern=QRegExp("(\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3})");
    ruleIPv4Address.format=ruleIPv4AddressFormat;

    //BUG apply same coloring rule to port number as IP address
    rulePortNumber.pattern=QRegExp("\\d+$");
    rulePortNumber.format=ruleIPv4AddressFormat;

    ruleProtocolCommandFormat.setFontCapitalization(QFont::AllUppercase);
    ruleProtocolCommandFormat.setFontWeight(QFont::ExtraBold);
    ruleProtocolCommandFormat.setForeground(Qt::darkGreen);
    //BUG rule is not applied, i.e. text coloring is not active
    ruleProtocolCommand.pattern=QRegExp("^CMD.\\*");
    ruleProtocolCommand.format=ruleProtocolCommandFormat;

    ruleProtocolCommandAcknowledgeFormat.setFontCapitalization(QFont::AllUppercase);
    ruleProtocolCommandAcknowledgeFormat.setFontWeight(QFont::ExtraBold);
    ruleProtocolCommandAcknowledgeFormat.setForeground(Qt::darkMagenta);
    //BUG rule is not applied, i.e. text coloring is not active
    ruleProtocolCommandAcknowledge.pattern=QRegExp("^ACK.\\*");
    ruleProtocolCommandAcknowledge.format=ruleProtocolCommandAcknowledgeFormat;

    m_ueHighlightRules.append(ruleInfo);
    m_ueHighlightRules.append(ruleWarning);
    m_ueHighlightRules.append(ruleError);
    m_ueHighlightRules.append(ruleIPv4Address);
    m_ueHighlightRules.append(rulePortNumber);
    m_ueHighlightRules.append(ruleProtocolCommand);
    m_ueHighlightRules.append(ruleProtocolCommandAcknowledge);
}

现在，在使用此类的应用程序中，我有以下示例日志QString：

来自主机的新传入连接，使用IP地址192.168.1.4 港口56748

端口号的正则表达式是什么（字符串末尾的数字，其后面是 port - 区分大小写）< strong> AND 激动地 ONE 空白？

Answer 1

\d+$正则表达式将匹配字符串末尾的1位或更多位数，无论左手上下文如何。

您应该考虑使用捕获方法："\\bport +(\\d+)$"（并访问捕获＃1）。这需要进行一些代码调整。

原因是QRegExp does not support a lookbehind：

支持零宽度正和零宽度负前瞻断言(?=pattern)和(?!pattern)，其语法与Perl相同。 Perl的lookbehind断言，“独立”子表达式和条件表达式 不支持。

如果您只需要匹配ASCII水平空格，则可以使用[ \t]替换空格（或者您可以尝试使用\s \r并\n排除"[^\\S\r\n]" - {{ 1}}）。

Answer 2

是否有理由不能使用port \d+$之类的内容？

regexp for word＆＃34; port＆＃34;以下空格和数字

2 个答案: