import re

data = """This is my phone number and I am 25 years old, 999-888-7894 and I am looking for a regex script.
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx  999-123-4567 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
And 555-555-1212 is my telephone."""

phno = re.compile(r'\b(?:phone|ph|telephone)\b.{0,49}\b(\d{3}[-]\d{3}[-]\d{4})\b|\b(\d{3}[-]\d{3}[-]\d{4})\b.{0,49}\b(?:phone|ph|telephone)\b', flags=re.I)

phones = [m.group(1) if m.group(1) else m.group(2) for m in phno.finditer(data)]
print(phones)