Search and Comparison Options - NSAnchoredSearch
These values represent the options available to many of the string classes’ search and comparison methods.
enum {
NSCaseInsensitiveSearch = 1,
NSLiteralSearch = 2,
NSBackwardsSearch = 4,
NSAnchoredSearch = 8,
NSNumericSearch = 64,
NSDiacriticInsensitiveSearch = 128,
NSWidthInsensitiveSearch = 256,
NSForcedOrderingSearch = 512,
NSRegularExpressionSearch = 1024
};
Constants
NSCaseInsensitiveSearch
- A case-insensitive search.
NSLiteralSearch
- Exact character-by-character equivalence.
NSBackwardsSearch
- Search from end of source string.[NSString NSAnchoredSearch]
NSAnchoredSearch
- Search is limited to start (or end, if
NSBackwardsSearch
) of source string. NSNumericSearch
- Numbers within strings are compared using numeric value, that is,
Name2.txt
<Name7.txt
<Name25.txt
.This option only applies to compare methods, not find. NSDiacriticInsensitiveSearch
- Search ignores diacritic marks.[NSString NSAnchoredSearch]For example, ‘รถ’ is equal to ‘o’.
NSWidthInsensitiveSearch
- Search ignores width differences in characters that have full-width and half-width forms, as occurs in East Asian character sets.For example, with this option, the full-width Latin small letter 'a' (Unicode code point U+FF41) is equal to the basic Latin small letter 'a' (Unicode code point U+0061).
NSForcedOrderingSearch
- Comparisons are forced to return either
NSOrderedAscending
orNSOrderedDescending
if the strings are equivalent but not strictly equal.This option gives stability when sorting. For example, “aaa” is greater than "AAA” ifNSCaseInsensitiveSearch
is specified. NSRegularExpressionSearch
- The search string is treated as an ICU-compatible regular expression. If set, no other options can apply except
NSCaseInsensitiveSearch
andNSAnchoredSearch
. You can use this option only with therangeOfString:...
methods andstringByReplacingOccurrencesOfString:withString:options:range:
.
Discussion of [NSString NSAnchoredSearch]
See “Searching, Comparing, and Sorting Strings” for details on the effects of these options.
Example of [NSString NSAnchoredSearch]
NSString *searchString = @"age";
NSString *beginsTest = @"Agencies";
NSRange prefixRange = [beginsTest rangeOfString:searchString
options:(NSAnchoredSearch | NSCaseInsensitiveSearch)];
// prefixRange = {0, 3}
Example of [NSString NSAnchoredSearch]
NSString *newString = [myString stringByReplacingOccurrencesOfString:@"http://"
withString:@""
options:NSAnchoredSearch // beginning of string
range:NSMakeRange(0, [myString length])]
Example of [NSString NSAnchoredSearch]
- (void)search {
NSString *searchText = [searchBar.text lowercaseString];
for (int index = 0; index < [availableCollectionArray count]; index++) {
NSArray *tempArray = [availableCollectionArray objectAtIndex:index];
for (int tempIndex = 0; tempIndex < [tempArray count] ; tempIndex++) {
NSString *sortedString = [tempArray objectAtIndex:tempIndex];
NSRange searchRange = [sortedString rangeOfString:searchText options:NSAnchoredSearch];
if (searchRange.length > 0)
{
[sortedArray addObject: sortedString]; //add the string which starts from searchBar.text
}
}
}
}