regex to find parenthesis and the numbers within. Java -

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what regex used find parenthesis , numbers within these paernthesis?

desired output:

  • input = "hello (1) world".replaceall(regex, "*");
  • result = hello * world

i tried following:

  • input = "hello (1) world".replaceall("([0-9])", "*");
  • result = ""hello (*) world"

why?

( , ) reserved characters in regexes (they create group). need escape them replace them: 

"hello (1) world".replaceall("\\([0-9]\\)", "*");

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