Ios 特定索引后字符的出现

有什么方法可以实现JAVA函数intindexof（intch，intfromindex）的功能吗

让我解释一下：

NSString *steSample = @"This is sample test string";

现在我想得到i的索引，但是在第二个索引之后。我怎样才能做到这一点

---

提前谢谢

我会这样做：

NSString *steSample = @"This is sample test string";
NSUInteger count = 0, length = [steSample length];
NSRange range = NSMakeRange(0, length);
while(range.location != NSNotFound)
{
    range = [steSample rangeOfString: @"i" options:0 range:range];
    if(range.location != NSNotFound)
    {
        range = NSMakeRange(range.location + range.length, length - (range.location + range.length));

        count++;
        if (count == 2)
        {
            NSLog(@"%d", range.location); // print 6 which is location of second 'i'
        }
    }
}

NSString *_sample = @"This is sample test string";
NSError *_error;
NSRegularExpression *_regExp = [NSRegularExpression regularExpressionWithPattern:@"i" options:NSRegularExpressionCaseInsensitive error:&_error];
NSArray *_matches = [_regExp matchesInString:_sample options:NSMatchingReportCompletion range:NSMakeRange(0, _sample.length)];
[_matches enumerateObjectsUsingBlock:^(NSTextCheckingResult * result, NSUInteger idx, BOOL *stop) {
    if (idx == 0) {
        NSLog(@"ignoring first occurance...");
    } else {
        NSLog(@"occurance's index : %d, character's index in string : %d", idx, result.range.location); // that line is simplified for your problem
    }
}];

ignoring first occurance...
occurance's index : 1, character's index in string : 5
occurance's index : 2, character's index in string : 23

注意：您可以重新排列实际的

if

语句，它当前会“跳过”第一次出现的语句，并打印其余的语句，但可以根据您的进一步愿望进行定制

---

我的控制台显示如下内容：

NSString *_sample = @"This is sample test string";
NSError *_error;
NSRegularExpression *_regExp = [NSRegularExpression regularExpressionWithPattern:@"i" options:NSRegularExpressionCaseInsensitive error:&_error];
NSArray *_matches = [_regExp matchesInString:_sample options:NSMatchingReportCompletion range:NSMakeRange(0, _sample.length)];
[_matches enumerateObjectsUsingBlock:^(NSTextCheckingResult * result, NSUInteger idx, BOOL *stop) {
    if (idx == 0) {
        NSLog(@"ignoring first occurance...");
    } else {
        NSLog(@"occurance's index : %d, character's index in string : %d", idx, result.range.location); // that line is simplified for your problem
    }
}];

ignoring first occurance...
occurance's index : 1, character's index in string : 5
occurance's index : 2, character's index in string : 23

---

我会这样做：

NSString *_sample = @"This is sample test string";
NSError *_error;
NSRegularExpression *_regExp = [NSRegularExpression regularExpressionWithPattern:@"i" options:NSRegularExpressionCaseInsensitive error:&_error];
NSArray *_matches = [_regExp matchesInString:_sample options:NSMatchingReportCompletion range:NSMakeRange(0, _sample.length)];
[_matches enumerateObjectsUsingBlock:^(NSTextCheckingResult * result, NSUInteger idx, BOOL *stop) {
    if (idx == 0) {
        NSLog(@"ignoring first occurance...");
    } else {
        NSLog(@"occurance's index : %d, character's index in string : %d", idx, result.range.location); // that line is simplified for your problem
    }
}];

ignoring first occurance...
occurance's index : 1, character's index in string : 5
occurance's index : 2, character's index in string : 23

注意：您可以重新排列实际的

if

语句，它当前会“跳过”第一次出现的语句，并打印其余的语句，但可以根据您的进一步愿望进行定制

---

我的控制台显示如下内容：

NSString *_sample = @"This is sample test string";
NSError *_error;
NSRegularExpression *_regExp = [NSRegularExpression regularExpressionWithPattern:@"i" options:NSRegularExpressionCaseInsensitive error:&_error];
NSArray *_matches = [_regExp matchesInString:_sample options:NSMatchingReportCompletion range:NSMakeRange(0, _sample.length)];
[_matches enumerateObjectsUsingBlock:^(NSTextCheckingResult * result, NSUInteger idx, BOOL *stop) {
    if (idx == 0) {
        NSLog(@"ignoring first occurance...");
    } else {
        NSLog(@"occurance's index : %d, character's index in string : %d", idx, result.range.location); // that line is simplified for your problem
    }
}];

ignoring first occurance...
occurance's index : 1, character's index in string : 5
occurance's index : 2, character's index in string : 23

---

我会这样做：

NSString *_sample = @"This is sample test string";
NSError *_error;
NSRegularExpression *_regExp = [NSRegularExpression regularExpressionWithPattern:@"i" options:NSRegularExpressionCaseInsensitive error:&_error];
NSArray *_matches = [_regExp matchesInString:_sample options:NSMatchingReportCompletion range:NSMakeRange(0, _sample.length)];
[_matches enumerateObjectsUsingBlock:^(NSTextCheckingResult * result, NSUInteger idx, BOOL *stop) {
    if (idx == 0) {
        NSLog(@"ignoring first occurance...");
    } else {
        NSLog(@"occurance's index : %d, character's index in string : %d", idx, result.range.location); // that line is simplified for your problem
    }
}];

ignoring first occurance...
occurance's index : 1, character's index in string : 5
occurance's index : 2, character's index in string : 23

注意：您可以重新排列实际的

if

语句，它当前会“跳过”第一次出现的语句，并打印其余的语句，但可以根据您的进一步愿望进行定制

---

我的控制台显示如下内容：

NSString *_sample = @"This is sample test string";
NSError *_error;
NSRegularExpression *_regExp = [NSRegularExpression regularExpressionWithPattern:@"i" options:NSRegularExpressionCaseInsensitive error:&_error];
NSArray *_matches = [_regExp matchesInString:_sample options:NSMatchingReportCompletion range:NSMakeRange(0, _sample.length)];
[_matches enumerateObjectsUsingBlock:^(NSTextCheckingResult * result, NSUInteger idx, BOOL *stop) {
    if (idx == 0) {
        NSLog(@"ignoring first occurance...");
    } else {
        NSLog(@"occurance's index : %d, character's index in string : %d", idx, result.range.location); // that line is simplified for your problem
    }
}];

ignoring first occurance...
occurance's index : 1, character's index in string : 5
occurance's index : 2, character's index in string : 23

---

我会这样做：

NSString *_sample = @"This is sample test string";
NSError *_error;
NSRegularExpression *_regExp = [NSRegularExpression regularExpressionWithPattern:@"i" options:NSRegularExpressionCaseInsensitive error:&_error];
NSArray *_matches = [_regExp matchesInString:_sample options:NSMatchingReportCompletion range:NSMakeRange(0, _sample.length)];
[_matches enumerateObjectsUsingBlock:^(NSTextCheckingResult * result, NSUInteger idx, BOOL *stop) {
    if (idx == 0) {
        NSLog(@"ignoring first occurance...");
    } else {
        NSLog(@"occurance's index : %d, character's index in string : %d", idx, result.range.location); // that line is simplified for your problem
    }
}];

ignoring first occurance...
occurance's index : 1, character's index in string : 5
occurance's index : 2, character's index in string : 23

注意：您可以重新排列实际的

if

语句，它当前会“跳过”第一次出现的语句，并打印其余的语句，但可以根据您的进一步愿望进行定制

---

我的控制台显示如下内容：

NSString *_sample = @"This is sample test string";
NSError *_error;
NSRegularExpression *_regExp = [NSRegularExpression regularExpressionWithPattern:@"i" options:NSRegularExpressionCaseInsensitive error:&_error];
NSArray *_matches = [_regExp matchesInString:_sample options:NSMatchingReportCompletion range:NSMakeRange(0, _sample.length)];
[_matches enumerateObjectsUsingBlock:^(NSTextCheckingResult * result, NSUInteger idx, BOOL *stop) {
    if (idx == 0) {
        NSLog(@"ignoring first occurance...");
    } else {
        NSLog(@"occurance's index : %d, character's index in string : %d", idx, result.range.location); // that line is simplified for your problem
    }
}];

ignoring first occurance...
occurance's index : 1, character's index in string : 5
occurance's index : 2, character's index in string : 23

---

regex方法对我来说太复杂了：）

我们不能修剪一下然后再找吗

那将是3行

包装在一个类别中：

#import <Foundation/Foundation.h>

@interface NSString (Extend)
-(NSUInteger)indexOfSubstring:(NSString*)needle afterIndex:(NSUInteger)index;
@end
@implementation NSString (Extend) 
-(NSUInteger)indexOfSubstring:(NSString*)needle afterIndex:(NSUInteger)index {
    id str = [self substringFromIndex:index];

    NSUInteger i = [str rangeOfString:needle].location;
    return i==NSNotFound ? i : i+index;
}
@end

---

regex方法对我来说太复杂了：）

我们不能修剪一下然后再找吗

那将是3行

包装在一个类别中：

#import <Foundation/Foundation.h>

@interface NSString (Extend)
-(NSUInteger)indexOfSubstring:(NSString*)needle afterIndex:(NSUInteger)index;
@end
@implementation NSString (Extend) 
-(NSUInteger)indexOfSubstring:(NSString*)needle afterIndex:(NSUInteger)index {
    id str = [self substringFromIndex:index];

    NSUInteger i = [str rangeOfString:needle].location;
    return i==NSNotFound ? i : i+index;
}
@end

---

regex方法对我来说太复杂了：）

我们不能修剪一下然后再找吗

那将是3行

包装在一个类别中：

#import <Foundation/Foundation.h>

@interface NSString (Extend)
-(NSUInteger)indexOfSubstring:(NSString*)needle afterIndex:(NSUInteger)index;
@end
@implementation NSString (Extend) 
-(NSUInteger)indexOfSubstring:(NSString*)needle afterIndex:(NSUInteger)index {
    id str = [self substringFromIndex:index];

    NSUInteger i = [str rangeOfString:needle].location;
    return i==NSNotFound ? i : i+index;
}
@end

---

regex方法对我来说太复杂了：）

我们不能修剪一下然后再找吗

那将是3行

包装在一个类别中：

#import <Foundation/Foundation.h>

@interface NSString (Extend)
-(NSUInteger)indexOfSubstring:(NSString*)needle afterIndex:(NSUInteger)index;
@end
@implementation NSString (Extend) 
-(NSUInteger)indexOfSubstring:(NSString*)needle afterIndex:(NSUInteger)index {
    id str = [self substringFromIndex:index];

    NSUInteger i = [str rangeOfString:needle].location;
    return i==NSNotFound ? i : i+index;
}
@end

---

---

第二个

i

的位置是5。在成功找到字符后，但在记录值之前，您似乎正在修改范围。我也在考虑这种方法，但我认为使用

[NSString enumerateSubstringsInRange:options:usingBlock:

可能不那么复杂。第二个

I

的位置是5。在成功找到字符后，但在记录值之前，您似乎正在修改范围。我也在考虑这种方法，但我认为使用

[NSString enumerateSubstringsInRange:options:usingBlock:

可能不那么复杂。第二个

I

的位置是5。在成功找到字符后，但在记录值之前，您似乎正在修改范围。我也在考虑这种方法，但我认为使用

[NSString enumerateSubstringsInRange:options:usingBlock:

可能不那么复杂。第二个

I

的位置是5。在成功找到字符后，但在记录值之前，您似乎正在修改范围。我也在考虑这种方法，但我认为使用

[NSString enumerateSubstringsInRange:options:usingBlock:

可能不那么复杂。太好了！！谢谢@holexfind这太复杂了——为什么我们要编译正则表达式模式even@Daij-Djan，阅读或理解起来很复杂，或者你的意思是什么？实际上我的意思是——对于一个相当简单的任务来说，代码太多了；）有点像：“用大锤敲坚果”太棒了！！谢谢@holexfind这太复杂了——为什么我们要编译正则表达式模式even@Daij-Djan，阅读或理解起来很复杂，或者你的意思是什么？实际上我的意思是——对于一个相当简单的任务来说，代码太多了；）有点像：“用大锤敲坚果”太棒了！！谢谢@holexfind这太复杂了——为什么我们要编译正则表达式模式even@Daij-Djan，阅读或理解起来很复杂，或者你的意思是什么？实际上我的意思是——对于一个相当简单的任务来说，代码太多了；）有点像：“用大锤敲坚果”太棒了！！谢谢@holexfind这太复杂了——为什么我们要编译正则表达式模式even@Daij-Djan，阅读或理解起来很复杂，或者你的意思是什么？实际上我的意思是——对于一个相当简单的任务来说，代码太多了；）有点像：“用大锤敲碎坚果”这正是我要找的。令人惊叹的！！这正是我要找的。令人惊叹的！！这正是我要找的。令人惊叹的！！这正是我要找的。令人惊叹的！！