use std, regex

(: matching :)
if "some matchable string" =~ /^some" "+[a-z]*" "+string$/
  echo string matches
else
  echo string "doesn't" match

(: replacing :)
let t = strdup "some allocated string"
t =~ s/a/"4"/g
t =~ s/e/"3"/g
t =~ s/i/"1"/g
t =~ s/o/"0"/g
t =~ s/s/$/g
print t
free t

(: flushing regex allocations :)
uninit regex

check mem leak; use dbg (:optional:)