objective c - NSPredicate to match string with an array of prefixes -

i'm unsure how write nspredicate achieve following. have array of prefixes, , want know if of them (plus underscore) prefix of given string. don't need know matched, yes/no if matched @ all.

i can't seem work out, @ moment have this

#import <foundation/foundation.h>  int main(int argc, char *argv[]) {     @autoreleasepool {         nsarray *bins = @[@"aaa", @"bbb", @"ccc"];         nsstring* item = @"aaa_blah";          nspredicate *pred = [nspredicate predicatewithformat:@"%@ beginswith self", item];          nslog(@"%@", [[bins filteredarrayusingpredicate:pred] count] ? @"yes" : @"no");     } } 

the way think of doing filtering array - firstly there better approach?

and secondly, want return true if prefix followed underscore so

@[@"aaa", @"bbb", @"ccc"];  @"aaa_blah"; // yes @"aaablah"; // no @"bbbblah"; // no 

i'm not sure how that?

+(void)checkifexists:(nsarray *)prefixes inmyobjects:(nsarray *)myobjects withdivider:(nsstring *)divider {     divider = @"_";     prefixes = @[@"aaa",@"bbb",@"ccc"];     myobjects = @[@"aaa_sd",@"dsf_ds",@"aaa_sss",@"aaabbb"];      nsmutablearray * resultsofpredicate = [nsmutablearray new];      (nsstring * pre in prefixes)     {         nsstring * iamlookingfor = [nsstring stringwithformat:@"%@%@", pre, divider];          nspredicate *prefixpredicate = [nspredicate predicatewithformat:@"self beginswith[c] %@", iamlookingfor];          nsarray * resultofsearch = [myobjects copy];          resultofsearch = [resultofsearch filteredarrayusingpredicate:prefixpredicate];          nslog(@"ros %@",resultofsearch);          [resultsofpredicate addobject:@([resultofsearch count])];     }      (int = 0; i<[resultsofpredicate count]; i++)     {         nslog(@"prefix %@ isappeared:%d",[prefixes objectatindex:i], [[resultsofpredicate objectatindex:i] boolvalue]);     } } 

i hope help.