how to parse special identifiers

[HuStmpHrrr]

Hi, it is often that identifiers are captured by this rule [a-zA-Z_]+. this regex, however, captures true and false, among other special identifiers, which I would like to single out in the parser. I don't seem to notice an easy way to handle it. how is it typically handled in pest?

[BilakshanP]

ident = @{ ('a'..'z' | 'A'..'Z' | "_")+ }

true    =  { "true" }
false   =  { "false" }
boolean = @{ true | false }

if   = @{ "if" }
else = @{ "else" }

// match identifiers at last
expr = { if | else | boolean | ident }

statement = { expr+ }

WHITESPACE = _{ " " }

You match your expressions in decreasing order of specificity. (I am forgetting the exact term)