Install RegexKitLite
First download RegexKitLite.
Configure your project
Double-click the project target under Targets in the Groups & Files sidebar.
Under the Linking header add -licucore to the Other Linker Flags setting.
Setup documentation
In the Xcode menu, open Xcode->Preferences->Documentation. Then click the Add Publisher button.
Add this URL:
feed://regexkit.sourceforge.net/RegexKitLiteDocSets.atom
Using RegexKitLite
This will extract the integer that is embedded in a td tag:
NSString *regex = @"<td id\"amount\">(\\d+)</td>";
NSString *body = [[[NSString alloc] initWithData:html encoding: NSASCIIStringEncoding] autorelease];
NSString *amount = [body stringByMatching:regex capture:1];
if ([amount isEqual:@""] == NO) {
NSLog(@"Amount is %@", amount);
} else {
NSLog(@"Amount was not found.");
}