ios 正则表达式

1,使用系统的方法

- (BOOL)match:(NSString *)pattern
{
    // 1.创建正则表达式
    NSRegularExpression *regex = [[NSRegularExpression alloc] initWithPattern:pattern options:0 error:nil];
    // 2.测试字符串
    NSArray *results = [regex matchesInString:self options:0 range:NSMakeRange(0, self.length)];
    
    return results.count > 0;
}

- (BOOL)isQQ
{
    // 1.不能以0开头
    // 2.全部是数字
    // 3.5-11位
    return [self match:@"^[1-9]\\d{4,10}$"];
}

- (BOOL)isPhoneNumber
{
    // 1.全部是数字
    // 2.11位
    // 3.以13\15\18\17开头
    return [self match:@"^1[3578]\\d{9}$"];
    // JavaScript的正则表达式:\^1[3578]\\d{9}$\
    
}

- (BOOL)isIPAddress
{
    // 1-3个数字: 0-255
    // 1-3个数字.1-3个数字.1-3个数字.1-3个数字
    return [self match:@"^\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}$"];
}

2.使用第三方开源库

RegexKitLite.h

1.设置非 ARC模式 

-fno-objc-arc

2.添加依赖的库

libicucore.dylib

3.使用规则

NSMutableAttributedString *attributedText = [[NSMutableAttributedString alloc] init];
    
    // 表情的规则
    NSString *emotionPattern = @"\\[[0-9a-zA-Z\\u4e00-\\u9fa5]+\\]";
    // @的规则
    NSString *atPattern = @"@[0-9a-zA-Z\\u4e00-\\u9fa5-_]+";
    // #话题#的规则
    NSString *topicPattern = @"#[0-9a-zA-Z\\u4e00-\\u9fa5]+#";
    // url链接的规则
    NSString *urlPattern = @"\\b(([\\w-]+://?|www[.])[^\\s()<>]+(?:\\([\\w\\d]+\\)|([^[:punct:]\\s]|/)))";
    NSString *pattern = [NSString stringWithFormat:@"%@|%@|%@|%@", emotionPattern, atPattern, topicPattern, urlPattern];
    
    // 遍历所有的特殊字符串
    NSMutableArray *parts = [NSMutableArray array];
    
    [text enumerateStringsMatchedByRegex:pattern usingBlock:^(NSInteger captureCount, NSString *const __unsafe_unretained *capturedStrings, const NSRange *capturedRanges, volatile BOOL *const stop) {
        if ((*capturedRanges).length == 0) return;
        
        HWTextPart *part = [[HWTextPart alloc] init];
        part.special = YES;
        part.text = *capturedStrings;
        part.emotion = [part.text hasPrefix:@"["] && [part.text hasSuffix:@"]"];
        part.range = *capturedRanges;
        [parts addObject:part];
    }];
    
    // 遍历所有的非特殊字符
    [text enumerateStringsSeparatedByRegex:pattern usingBlock:^(NSInteger captureCount, NSString *const __unsafe_unretained *capturedStrings, const NSRange *capturedRanges, volatile BOOL *const stop) {
        if ((*capturedRanges).length == 0) return;
        
        HWTextPart *part = [[HWTextPart alloc] init];
        part.text = *capturedStrings;
        part.range = *capturedRanges;
        [parts addObject:part];
    }];