参考如下方法说明：
//提取字符串
+ (void)extractStr{
NSString *orignalStr = @"eos:cobowalletio?memo=1e892fee";
NSString *regStr = @"[:|=]([^\?]){0,}";
NSRegularExpression *regEx = [[NSRegularExpression alloc] initWithPattern:regStr options:NSRegularExpressionAllowCommentsAndWhitespace error:nil];
NSMutableArray* stringArray = [[NSMutableArray alloc] init];
[regEx enumerateMatchesInString:orignalStr options:NSMatchingReportCompletion range:NSMakeRange(0, orignalStr.length) usingBlock:^(NSTextCheckingResult * _Nullable result, NSMatchingFlags flags, BOOL * _Nonnull stop) {
//从NSTextCheckingResult类中取出range属性
NSRange range = result.range;
NSLog(@"range=== %@",@(range.length));
if (range.length>0) {
/*
这里处理一下，不处理将返回如下
:cobowalletio,
=1e892fee
*/
range.location = range.location+1;
range.length = range.length -1;
//从原文本中将字段取出并存入一个NSMutableArray中
[stringArray addObject:[orignalStr substringWithRange:range]];
}
}];
NSUInteger number = [regEx numberOfMatchesInString:orignalStr options:NSMatchingReportCompletion range:NSMakeRange(0, orignalStr.length)];
//这里如果number大于0说明字符串符合正则规则
NSLog(@"number == %@",@(number));
NSLog(@"%@",stringArray);
}
