Groovy/Java split string on parentheses “(”

Question

I am trying to perform a split similar the following:

println \"Hello World(1)\".split(\"W\");

Output:

[Hello , orld(1)]


        

Answer 1

Since split just accept regex, you have to pass to it as an escaped character. For this, you must append a backslash in front of it

\(

But above has a compile error because it is parsed as a valid escaped character such as:

\t Tab
\n New Line or Line Feed
\r Carriage Return

So, you must pass a non meaning character (E.g. parenthesis) with 2 backslashes:

\\(

Finally:

println "Hello World(1)".split("\\(");

OR you can also do all things by java builtin function of class Pattern named quote:

println "Hello World(1)".split(Pattern.quote("("));

Answer 2

println "Hello World(1)".split("\\(");

Answer 3

you have to escape the bracket character properly

println "Hello World(1)".split("\\(")

Answer 4

The split method takes a regular expression pattern.

If you want to split on "just a regular string" you can use Pattern.quote to quote the string first:

println "Hello World(1)".split(Pattern.quote("("))

Answer 5

You can also use a single escape when using groovy native regex syntax:

assert "Hello World(1)".split(/\(/) == ["Hello World", "1)"]