iOS系统自带正则表达式简单运用

//组装一个字符串，把里面的网址解析出来

NSString *urlString = @"sfdshttp://www.baidu.com";

NSError *error;

//http+:[^\\s]* 这是检测网址的正则表达式

NSRegularExpression *regex = [NSRegularExpressionregularExpressionWithPattern:@"http+:[^\\s]*"options:0error:&error];

if (regex != nil) {

NSTextCheckingResult *firstMatch = [regex firstMatchInString:urlString options:0range:NSMakeRange(0, [urlString length])];

if (firstMatch) {

NSRange resultRange = [firstMatch rangeAtIndex:0];

//从urlString中截取数据

NSString *result = [urlString substringWithRange:resultRange];

NSLog(@"%@",result);

}

}

NSString *stringC = @"weiboyuan@163.com";

//匹配输入的联系方式是否为QQ号码或者电子邮箱

NSString *patternQQ = @"^[1-9](\\d){4,9}$";

NSString *patternEmail = @"\\b([a-zA-Z0-9%_.+\\-]+)@([a-zA-Z0-9.\\-]+?\\.[a-zA-Z]{2,6})\\b";

//    NSError *error = NULL;

//定义正则表达式

NSRegularExpression *regexQQ = [NSRegularExpressionregularExpressionWithPattern:patternQQ options:0error:&error];

NSRegularExpression *regexEmail = [NSRegularExpressionregularExpressionWithPattern:patternEmail options:0error:&error];

//使用正则表达式匹配字符

NSTextCheckingResult *isMatchQQ = [regexQQ firstMatchInString:stringC

options:0

range:NSMakeRange(0, [stringC length])];

NSTextCheckingResult *isMatchEmail = [regexEmail firstMatchInString:stringC

options:0

range:NSMakeRange(0, [stringC length])];

if (isMatchQQ || isMatchEmail)

{

NSLog(@"是 QQ或者邮箱");

}

else

{

NSLog(@"不是 QQ或者邮箱");

}