Regex to catch what user has put in text box

[Pedroski55]

I think you need to know a bit about what to anticipate when creating a re expression.

At first you said Firstname.Lastname and I presumed you meant English.

Your thing here is: something followed by . maybe repeated but not . at the end.

\S will find anything, including the hyphens used in some names, like Henry James William Forsythe-Wallington-Beardsley-Carruthers

\S stops at space, \S is the opposite of \s

If someone enters any of these as names:

name = '王聪明 的 弟弟 Pedro Rodriguez Carlos.Sanchez.Rumores.Paz.Pasamar'
name2 = '王聪明 的 弟弟 Pedro Rodriguez Carlos.Sanchez-Rumores-Paz.Pasamar'
name3 = '王聪明 的 弟弟 Pedro Rodriguez Carlos.Sanchez-Rumores-Paz.Pasa-mar'

You can find the bits connected with . using:

e = re.compile(r'(\S+\.)+\S+')

Output:
res = i.search(name3)
res.group()
'Carlos.Sanchez-Rumores-Paz.Pasa-mar'
res = i.search(name)
res.group()
'Carlos.Sanchez.Rumores.Paz.Pasamar'
res = i.search(name2)
res.group()
'Carlos.Sanchez-Rumores-Paz.Pasamar'

But if the user is French and enters:

nombre = "Pierre le Guen le Mercier"

You won't get anything!

But if monsieur enters:

nombre2 = "Pierre.le.Guen.le.Mercier"
res = i.search(nombre2)

Output:
res.group()
'Pierre.le.Guen.le.Mercier'

Regex expressions are a science unto themselves!