Objective-C Cocoa 应用程序中的正则表达式

Objective-C是一种用于开发macOS和iOS应用程序的面向对象编程语言。在Cocoa应用程序中，正则表达式是一种强大的工具，用于匹配和处理文本数据。本文将介绍在Objective-C Cocoa应用程序中使用正则表达式的方法，并提供一些实际案例代码。

objective-c
NSString *input = @"Hello, 123 World!";
NSString *pattern = @"\\d+";
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:pattern options:0 error:nil];
NSArray *matches = [regex matchesInString:input options:0 range:NSMakeRange(0, input.length)];
for (NSTextCheckingResult *match in matches) {
    NSString *substring = [input substringWithRange:match.range];
    NSLog(@"Found: %@", substring);
}

objective-c
NSString *input = @"Hello, World!";
NSString *pattern = @"\\s+";
NSString *replacement = @"_";
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:pattern options:0 error:nil];
NSString *result = [regex stringByReplacingMatchesInString:input options:0 range:NSMakeRange(0, input.length) withTemplate:replacement];
NSLog(@"Result: %@", result);

objective-c
NSString *input = @"Email me at hello@example.com or contact me at hi@example.com";
NSString *pattern = @"\\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,}\\b";
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:pattern options:0 error:nil];
[regex enumerateMatchesInString:input options:0 range:NSMakeRange(0, input.length) usingBlock:^(NSTextCheckingResult * _Nullable result, NSMatchingFlags flags, BOOL * _Nonnull stop) {
    NSString *email = [input substringWithRange:result.range];
    NSLog(@"Email: %@", email);
}];