How to highlight UILabel formatted phone number while searching [duplicate] - objective-c

Question

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How to search(Predicate) content from list like Xcode suggestion?
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Closed 4 years ago.
How to highlight UILabel with formatted phone number while searching?
Example:
A cell is displaying a list of contacts with a number like: [phone]
If I type 3, I want + and 3 to be highlighted (colored differently)
If I type 38160, I want +381 60 to be highlighted (colored differently).
And so on...
The main point of this question is how to color the matching numbers by jumping over white spaces and + sign?
Here is what I've tried so far, but it works only if I remove white spaces and + sign from the label's text value:
// Highlighted search for numbers
NSString *phoneString = #"[phone]";
NSString *searchString = #"38160";
NSMutableAttributedString *string = [[NSMutableAttributedString alloc] initWithString:phoneString];
NSRange selectedRange = [[string string] rangeOfString:searchString options:NSRegularExpressionSearch];
if (selectedRange.location != NSNotFound) {
[string beginEditing];
[string addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:selectedRange];
[string endEditing];
}
cell.phoneNumberLabel.attributedText = string;

Answer 1

Thanks to #Larme, I have answered my own question :)
// Highlighted search for numbers
NSString *phoneString = #"[phone]";
NSString *firstComponent = #"\\+?"; // Skip a leading + char
NSMutableArray *digits = [[NSMutableArray alloc] init];
[self.searchString enumerateSubstringsInRange:NSMakeRange(0, [self.searchString length])
options:NSStringEnumerationByComposedCharacterSequences
usingBlock:^(NSString * _Nullable substring, NSRange substringRange, NSRange enclosingRange, BOOL * _Nonnull stop) {
[digits addObject:substring];
}];
NSString *pattern = [[NSString alloc] initWithFormat:#"%#%#", firstComponent, [digits componentsJoinedByString:#"\\s?"]];
NSMutableAttributedString *string = [[NSMutableAttributedString alloc] initWithString:phoneString];
NSRange selectedRange = [[string string] rangeOfString:pattern options:NSRegularExpressionSearch];
if (selectedRange.location != NSNotFound) {
[string beginEditing];
[string addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:selectedRange];
[string endEditing];
}
cell.phoneNumberLabel.attributedText = string;