IOS Search keyword highlighting

/** Regular matching keyword highlighting

Keyword is the key word that needs to be highlighted.

Options:nsregularexpressioncaseinsensitive is case insensitive

*／

nsmutableattributedstring* newstring = [[Nsmutableattributedstring alloc] initWithString:model.totalstring];

Nsregularexpression *regex = [[Nsregularexpression alloc]initwithpattern:[nsstring stringWithFormat:@ "%@", KeyWord] Options:nsregularexpressioncaseinsensitive Error:nil];

[Regex enumerateMatchesInString:model.totalstring options:nsmatchingreportprogress range:nsmakerange (0, Model.totalstring length]) usingblock:^ (Nstextcheckingresult *result, nsmatchingflags flags, BOOL *stop) {
[NewString AddAttribute: (nsstring*) Nsforegroundcolorattributename
Value: (ID) [Uicolor redcolor]
Range:result.range];

} ];

The second method

//    Nsrange range = [[content lowercasestring] rangeofstring:[specialstr lowercasestring]];
//    nsmutableattributedstring *attribute = [[Nsmutableattributedstring alloc] initWithString: Content];
//    [attribute Addattribute:nsforegroundcolorattributename Value:[uicolor blue] range:range];
//    return attribute;