Question

I have a NSMutableArray where i want to replace the sign | into a ; how can i do that?

NSMutableArray *paths = [dic valueForKey:@"PATH"];
NSLog(@"pathArr ",  paths)
pathArr (
    (
       "29858,39812;29858,39812;29925,39804;29936,39803;29949,39802;29961,39801;30146,39782;30173,39779;30220,39774;30222,39774|30215,39775;30173,39779;30146,39782;29961,39801;29949,39802;29936,39803;29925,39804;29858,39812;29858,39812;29856,39812;29800,39819;29668,39843;29650,39847;29613,39855;29613,39855;29613,39856;29605,39857;29603,39867;29603,39867;29599,39892;29596,39909;29587,39957;29571,40018;29563,40038;29560,40043"
    )
)

Update

This is where i got my path from

NSArray *BusRoute = alightDesc;
int i;
int count = [BusRoute count];
for (i = 0; i < count; i++)
{   
    NSLog (@"BusRoute = %@", [BusRoute objectAtIndex: i]);
    NSDictionary *dic = [BusRoute objectAtIndex: i];
    NSMutableArray *paths = [dic valueForKey:@"PATH"];
}

Answer 1

Provide that your object in the array path is string, you can do this

NSMutableArray *path2=[[NSMutableArray alloc]initWithArray:nil];
for (NSObject *obect in path) {
    for (NSString *string in (NSArray*)obect) {
        [path2 addObject:[string stringByReplacingOccurrencesOfString:@"|" withString:@","]];
    }

}

NSLog(@"pathArr %@ ",  path2);

your array paths contains an another array which has string as object.
Hope this helps