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

Question

This is a sample string

hi #myname, you  got #amount

I want to find all words using java regx, that starts with # and ends with space or . example #myname,#amount

I tried the following Regex, but it doesn't work.

String regx = "^#(\s+)";

Answer 1

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()) {
   ...
}