Use ParseKit's `PKTokenizer` class to tokenize HLA-style hex numbers like `$00FF_FFFF` and binary numbers like `%0001_0101`

gistfile1.m

NSString *s = @"$00FF_FFFF %0001_0101";
PKTokenizer *t = [PKTokenizer tokenizerWithString:s];

// add support for HLA-style hex numbers like $00FF_FFFF
[t.numberState addPrefix:@"$" forRadix:16];
[t.numberState addGroupingSeparator:'_' forRadix:16];
[t setTokenizerState:t.numberState from:'$' to:'$'];

// add support for HLA-style binary numbers like %0001_0101
[t.numberState addPrefix:@"%" forRadix:2];
[t.numberState addGroupingSeparator:'_' forRadix:2];
[t setTokenizerState:t.numberState from:'%' to:'%'];

for (PKToken *tok in t) {
    NSLog(@"(%@) (%.1f) : %@", tok.stringValue, tok.floatValue, [tok debugDescription]];
}

// Prints:
// ($00FF_FFFF) (16777215.0) : <Number «16777215»>
// (%0001_0101) (21.0) : <Number «21»>