Multiple regex matches in Google Sheets formula

You may create your own custom function in the Script Editor:

function ExtractAllRegex(input, pattern,groupId) {
  return [Array.from(input.matchAll(new RegExp(pattern,'g')), x=>x[groupId])];
}

Or, if you need to return all matches in a single cell joined with some separator:

function ExtractAllRegex(input, pattern,groupId,separator) {
  return Array.from(input.matchAll(new RegExp(pattern,'g')), x=>x[groupId]).join(separator);
}

Then, just call it like =ExtractAllRegex(A1, "\d-", 0, ", ").

Description:

• input - current cell value
• pattern - regex pattern
• groupId - Capturing group ID you want to extract
• separator - text used to join the matched results.

You can actually do this in a single formula using regexreplace to surround all the values with a capture group instead of replacing the text:

=join("",REGEXEXTRACT(A1,REGEXREPLACE(A1,"(\d-)","($1)")))

basically what it does is surround all instances of the \d- with a "capture group" then using regex extract, it neatly returns all the captures. if you want to join it back into a single string you can just use join to pack it back into a single cell: