groovy regular expression replacement foo-bar example

groovy-reg-foo-bar.groovy

// matcher
def m = "foo-bar" =~ /(.+)(-)(.+)/

println m[0]
println m[0][1]
println m[0][2]
println m[0][3]

assert m[0] == ["foo-bar", "foo", "-", "bar"]


def i = "foo-bar"

def o = i.replaceAll(/(.+)-(.+)/){zero, one, two -> one + two.capitalize()}

assert o == "fooBar"

println o

// -- http://naleid.com/blog/2008/05/19/dont-fear-the-regexp

def dashedToCamelCase(orig) {
    // regular expression is a dash, followed by parenthesis that form a group where we hold the word's first character
    orig.replaceAll(/-(\w)/) { 
        fullMatch, firstCharacter -> println fullMatch
                firstCharacter.toUpperCase() }
}

assert "firstName" == dashedToCamelCase("first-name")

assert "oneTwoThreeFourFiveSixSevenEight" == dashedToCamelCase("one-two-three-four-five-six-seven-eight")