ToDo:
Use an Edit Data --> Replace Text action in the workflow.
Select Regex option and replace by empty string.
You can also replace the match with any string you require.
Get Handles:
(^|\s|[^@\w])+[^@\s]+
Example: Hi @Something how are @you doing David.
Result: @Something @you
Get Hastags:
(^|\s|[^#\w])+[^#\s]+
Example: Hi #Something how are #you doing David.
Result: #Something #you
Remove Handles:
(?=(@\w+\b))
Example: Hi @Something how are @you doing David.
Result: Hi how are doing David.
Remove Hashtags:
(?=(#\w+\b))
Example: Hi #Something how are #you doing David.
Result: Hi how are doing David
Get a word or phrase:
\b(?!cat\b)\w+
Example: This cat is beautiful!!
Result: cat
Except a word or phrase:
\b(?=cat\b)\w+
Example: This cat is beautiful!!
Result: This is beautiful!!
Get Character(s):
Get 1st four characters (including space)
(?<=.{4}).+
Example: This cat is beautiful!!
Result: This
Get last four characters (including space)
.+(?=.{4})
Example: This cat is beautiful!!
Result: ul!!
** I will append more Regex scenario as I go through them. Please feel free to add or comment on the scenarios you go through more frequently and I will try to append it asap.