[Solved] I want to find all words using java regex, that starts with “#” and ends with space or “.”

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This one should be the way:

#(\w+)(?:[, .]|$)
  • # matches # literally
  • \w is a word with at least one letter
  • (?:) is non-capturing group
  • [, .]|$ is set of ending characters including the end of line $

For more information check out Regex101.

In Java don’t forget to escape with double \\:

String str = "hi #myname, you  got #amount";
Matcher m = Pattern.compile("#(\\w+)(?:[, .]|$)").matcher(str);
while (m.find()) {
   ...
}

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solved I want to find all words using java regex, that starts with “#” and ends with space or “.”