iOS 取出一段字符串里面的数字

+(NSString *)ModifyImidForName:(NSString *)originalStr{
AppDelegate *appdele = (AppDelegate *)[UIApplication sharedApplication].delegate;
//保存聊天页所有人的昵称，头像,聊天id
NSMutableDictionary *userInfoDic = [NSMutableDictionary dictionary];
//保存聊天页所有人的聊天id
NSMutableArray *arr = [NSMutableArray array];
NSString *contentStr;
//关键代码－－－－－－－－－－－－－start
NSString *regex = @"\\d*";
NSError *error;
NSRegularExpression *regular = [NSRegularExpression regularExpressionWithPattern:regex
                                                                         options:NSRegularExpressionCaseInsensitive
                                                                           error:&error];
// 对str字符串进行匹配
NSArray *matches = [regular matchesInString:originalStr
                                    options:0
                                      range:NSMakeRange(0, originalStr.length)];
// 遍历匹配后的每一条记录
for (NSTextCheckingResult *match in matches) {
    NSRange range = [match range];
    NSString *imid = [originalStr substringWithRange:range];
    
    if(imid.length > 0 && [self isNumber:imid]){
        //            NSLog(@"imid: %@", imid);
        [arr addObject:imid];
    }
}
//关键代码－－－－－－－－－－－－－end
if(arr.count > 0){
    contentStr = [originalStr mutableCopy];
    for (int i = 0; i < arr.count; i ++) {
        NSString *imid = arr[i];
        
        //如果还没有保存当前的imid，再从数据库获取数据
        if (![[userInfoDic allKeys] containsObject:imid]){
            NSMutableDictionary *dictionary = [appdele getSqliteCurrentData:imid];
            [userInfoDic setObject:dictionary forKey:imid];
        }
        
        //替换id为名字
        contentStr =  [contentStr stringByReplacingOccurrencesOfString:imid withString:userInfoDic[imid][@"name"]];
    }
    //            NSLog(@"mycontentStr: %@",contentStr);
}
return contentStr;
}