Try ,\s*\S+ing
Matches your first two phrases, doesn't match in your third phrase.
\s
means 'any whitespace', * means 0 or more of that, \S
means 'any non-whitespace' (capitalizing the letter is conventional for inverting the character set in regexes - works for \b
\s
\w
\d
), +
means 'one or more' and then we match ing
.