REBOL 3 Functions: charset

charset chars /length len

Makes a bitset of chars for the parse function.

Arguments:

chars [string! block! binary! char! integer!]

Refinements:

/length - Preallocate this many bits

len [integer!] - Must be > 0

Description

The charset function is a shortcut for:

make bitset! value

It is used often for character based bitsets.

chars: charset "aeiou"
print find chars "o"
true

print find "there you go" chars
ere you go

digits: charset "0123456789"
area-code: ["(" 3 digits ")"]
phone-num: [3 digits "-" 4 digits]
print parse "(707)467-8000" [[area-code | none] phone-num]
true