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→{{header|Groovy}}: new solution
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3. abracadabra ends with abr: false
</pre>
=={{header|Groovy}}==
{{trans|Java}}
Examples:
<lang groovy>assert "abcd".startsWith("ab")
assert ! "abcd".startsWith("zn")
assert "abcd".endsWith("cd")
assert ! "abcd".endsWith("zn")
assert "abab".contains("ba")
assert ! "abab".contains("bb")
assert "abab".indexOf("bb") == -1 // not found flag
assert "abab".indexOf("ab") == 0
def indicesOf = { string, substring ->
if (!string) { return [] }
def indices = [-1]
while (true) {
indices << string.indexOf(substring, indices.last()+1)
if (indices.last() == -1) break
}
indices[1..<(indices.size()-1)]
}
assert indicesOf("abab", "ab") == [0, 2]
assert indicesOf("abab", "ba") == [1]
assert indicesOf("abab", "xy") == []</lang>
All assertions pass, so there is no output.
=={{header|Haskell}}==
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