QRegularExpression 示例
QRegularExpression 示例通过提供一个环境，展示如何在Qt中将正则表达式应用于文本，用户可以在该环境中创建新的正则表达式，并针对自定义文本字符串进行测试。
该示例使用了在 Qt 5.0 中引入的QRegularExpression 类。QRegularExpression 实现了与 Perl 兼容的正则表达式，支持多种高级匹配功能，例如不区分大小写的匹配、多行匹配、Unicode 属性选择器以及部分/增量匹配。
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