Using Regex Patterns to find word phone numbers

import java.util.regex.Pattern

keypadMap = [0:"", 1:"", 2:"abc", 3:"def", 4:"ghi",
             5:"jkl", 6:"mno", 7:"pqrs", 8:"tuv", 9:"wxyz"]
dictionary = new File("words")
regexBuilder = { digit -> '[' + keypadMap[digit.toInteger()] + ']' }
patternBuilder = { number ->
    Pattern.compile('^' + number.collect(regexBuilder).join() + '$') }

def matchWords(phNumber) {
    def p = patternBuilder(phNumber)
    def matches = []
    dictionary.eachLine{ line -> if (p.matcher(line).matches()) matches << line }
    if (matches)
        println "Matches for $phNumber: " + matches.join(' ')
    else
        println "No matches found for $phNumber"
}

def matchPairs(phNumber) {
    def p1 = patternBuilder(phNumber[0..2])
    def p2 = patternBuilder(phNumber[3..6])
    def first = [], second = []
    dictionary.eachLine { line ->
        if (p1.matcher(line).matches()) first << line
        if (p2.matcher(line).matches()) second << line
    }
    if (first && second)
        println "$phNumber matches word pairs: " +
            [first, second].combinations().collect{ it.join '-' }.join(', ')
    else
        println "Couldn't find word pair for $phNumber"
}

[ '2345678', '2455466', '2276228', '6662342', '2476642',
  '2742742', '7338433', '7678243', '3742253', '7264253',
  '7683353', '7684453', '7837453', '7378453', '3749953',
  '7877363', '2668363', '5367273', '7377473', '7877673',
  '7278873', '2646283', '3377483'
].each{ matchWords it }
println '----------------'
[ '8765432', '9689474', '2896673', '6847687', '9687283', '2283278'
].each{ matchPairs it }

No matches found for 2345678
Matches for 2455466: billion
Matches for 2276228: acrobat
Matches for 6662342: monadic nomadic
Matches for 2476642: chromic chronic
Matches for 2742742: aphasia aphasic
Matches for 7338433: refugee seethed
Matches for 7678243: portage postage
Matches for 3742253: dribble friable
Matches for 7264253: panicle sanicle
Matches for 7683353: snuffle souffle
Matches for 7684453: smuggle snuggle
Matches for 7837453: puerile sterile
Matches for 7378453: reptile servile
Matches for 3749953: drizzle frizzle
Matches for 7877363: supreme suspend
Matches for 2668363: contend convene
Matches for 5367273: jeopard leopard
Matches for 7377473: reprise respire
Matches for 7877673: purpose suppose
Matches for 7278873: pasture rapture
Matches for 2646283: animate cognate
Matches for 3377483: deprive despite ferrite
----------------
Couldn't find word pair for 8765432
9689474 matches word pairs: you-wish
2896673 matches word pairs: buy-more, buy-nose
6847687 matches word pairs: mug-pour, mug-soup, mug-sour
9687283 matches word pairs: you-pate, you-pave, you-rate, you-rave, you-save, you-scud
2283278 matches word pairs: act-dart, bat-dart, cat-dart, act-east, bat-east, cat-east, act-fast, bat-fast, cat-fast