定义(最常用到的方法)：
-
NSPredicate *ca = [NSPredicate predicateWithFormat:(NSString *), ...];
Format：
(1)比较运算符>,<,==,>=,<=,!=
可用于数值及字符串
例：@"number > 100"
(2)范围运算符：IN、BETWEEN
例：@"number BETWEEN {1,5}"
@"address IN {‘shanghai‘,‘beijing‘}"
(3)字符串本身:SELF
例：@“SELF == ‘APPLE’"
(4)字符串相关：BEGINSWITH、ENDSWITH、CONTAINS
例：@"name CONTAIN[cd] ‘ang‘" //包含某个字符串
@"name BEGINSWITH[c] ‘sh‘" //以某个字符串开头
@"name ENDSWITH[d] ‘ang‘" //以某个字符串结束
注:[c]不区分大小写[d]不区分发音符号即没有重音符号[cd]既不区分大小写，也不区分发音符号。
(5)通配符：LIKE
例：@"name LIKE[cd] ‘*er*‘" //*代表通配符,Like也接受[cd].
@"name LIKE[cd] ‘???er*‘"
(6)正则表达式：MATCHES
例：NSString *regex = @"^A.+e$"; //以A开头，e结尾
@"name MATCHES %@",regex
实际应用：
(1)对NSArray进行过滤
-
NSArray *array = [[NSArray alloc]initWithObjects:@"beijing",@"shanghai",@"guangzou",@"wuhan", nil];
-
NSString *string = @"ang";
-
NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF CONTAINS %@",string];
-
NSLog(@"%@",[array filteredArrayUsingPredicate:pred]);
(2)判断字符串首字母是否为字母:
-
NSString *regex = @"[A-Za-z]+";
-
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];
-
-
if ([predicate evaluateWithObject:aString]) {
-
}
(3)字符串替换：
-
NSError* error = NULL;
-
NSRegularExpression* regex = [NSRegularExpression regularExpressionWithPattern:@"(encoding=\")[^\"]+(\")"
-
options:0
-
error:&error];
-
NSString* sample = @"<xml encoding=\"abc\"></xml><xml encoding=\"def\"></xml><xml encoding=\"ttt\"></xml>";
-
NSLog(@"Start:%@",sample);
-
NSString* result = [regex stringByReplacingMatchesInString:sample
-
options:0
-
range:NSMakeRange(0, sample.length)
-
withTemplate:@"$1utf-8$2"];
-
NSLog(@"Result:%@", result);
(4)截取字符串如下：
-
-
NSString *urlString=@"<meta/><link/><title>1Q84 BOOK1</title></head><body>";
-
-
-
NSError *error;
-
-
-
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"(?<=title\\>).*(?=</title)" options:0 error:&error];
-
-
if (regex != nil) {
-
NSTextCheckingResult *firstMatch=[regex firstMatchInString:urlString options:0 range:NSMakeRange(0, [urlString length])];
-
-
if (firstMatch) {
-
NSRange resultRange = [firstMatch rangeAtIndex:0];
-
-
-
NSString *result=[urlString substringWithRange:resultRange];
-
-
NSLog(@"->%@<-",result);
-
}
-
-
}
(5)判断手机号码，电话号码函数
-
-
- (BOOL)isMobileNumber:(NSString *)mobileNum
-
{
-
-
-
-
-
-
-
NSString * MOBILE = @"^1(3[0-9]|5[0-35-9]|8[025-9])\\d{8}$";
-
-
-
-
-
NSString * CM = @"^1(34[0-8]|(3[5-9]|5[017-9]|8[278])\\d)\\d{7}$";
-
-
-
-
-
NSString * CU = @"^1(3[0-2]|5[256]|8[56])\\d{8}$";
-
-
-
-
-
NSString * CT = @"^1((33|53|8[09])[0-9]|349)\\d{7}$";
-
-
-
-
-
-
-
-
NSPredicate *regextestmobile = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", MOBILE];
-
NSPredicate *regextestcm = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CM];
-
NSPredicate *regextestcu = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CU];
-
NSPredicate *regextestct = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CT];
-
-
if (([regextestmobile evaluateWithObject:mobileNum] == YES)
-
|| ([regextestcm evaluateWithObject:mobileNum] == YES)
-
|| ([regextestct evaluateWithObject:mobileNum] == YES)
-
|| ([regextestcu evaluateWithObject:mobileNum] == YES))
-
{
-
if([regextestcm evaluateWithObject:mobileNum] == YES) {
-
NSLog(@"China Mobile");
-
} else if([regextestct evaluateWithObject:mobileNum] == YES) {
-
NSLog(@"China Telecom");
-
} else if ([regextestcu evaluateWithObject:mobileNum] == YES) {
-
NSLog(@"China Unicom");
-
} else {
-
NSLog(@"Unknow");
-
}
-
-
return YES;
-
}
-
else
-
{
-
return NO;
-
}
-
}
(6)邮箱验证、电话号码验证:
-
-
-
+(BOOL)isValidateRegularExpression:(NSString *)strDestination byExpression:(NSString *)strExpression
-
-
{
-
-
NSPredicate *predicate = [NSPredicatepredicateWithFormat:@"SELF MATCHES %@", strExpression];
-
-
return [predicate evaluateWithObject:strDestination];
-
-
}
-
-
-
+(BOOL)isValidateEmail:(NSString *)email {
-
-
NSString *strRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{1,5}";
-
-
BOOL rt = [CommonTools isValidateRegularExpression:email byExpression:strRegex];
-
-
return rt;
-
-
}
-
-
-
+(BOOL)isValidateTelNumber:(NSString *)number {
-
-
NSString *strRegex = @"[0-9]{1,20}";
-
-
BOOL rt = [CommonTools isValidateRegularExpression:number byExpression:strRegex];
-
-
return rt;
-
-
}
(7)NSDate进行筛选
-
-
NSDate *endDate = [[NSDate date] retain];
-
NSTimeInterval timeInterval= [endDate timeIntervalSinceReferenceDate];
-
timeInterval -=3600*24*10;
-
NSDate *beginDate = [[NSDate dateWithTimeIntervalSinceReferenceDate:timeInterval] retain];
-
-
NSPredicate *predicate_date =
-
[NSPredicate predicateWithFormat:@"date >= %@ AND date <= %@", beginDate,endDate];
-
-
[fetchRequest setPredicate:predicate_date];
-
-
[endDate release];
-
[beginDate release];
原文地址: http://blog.csdn.net/lianbaixue/article/details/10579117
