import java.util.*;
import java.util.regex.*;
class Ideone
{
{
List
<String
> strs
= Arrays.
asList("\n123 : other",
"123 : other",
"\n4 : smth",
"123 : a"); System.
out.
println("\"" + str.
replaceFirst("\n[0-9]+\\s+:\\s*",
"") + "\"");
}
}
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