Why the regex doesn't catch "Extra" group?

senglory

The regex:

[code]
# Region

s*Region:s*
(?.+?(?=))
s*

s*


s*

#Optional AD
(

s*

s*
]*?)>
(?:.+?)s*s*
){0,1}


s*

(
# Amenities
]*?)>
s*

(?:.+?)

(?.+?)

s*

){0,1}



(?:.+?)

#Extra
(

s*(?.+?)s*

){0,1}
[/code]


The text to be processed:

[code]

Drive
Front


Transm
Mech


Intr
Leather



COND/td>
USED


Region/td>
QQQQQQQQQQQQQ

What's inside

• • ABS
  • Acs
  • HUD
  • Immo
• • Chairs
  • Alarm

Extra info

Good condition. Assembled in ---------

[/code]

Why doesn't it return me "Good condition. Assembled in ---------" for "Extra" group? This group is actually optional; that's why I marked it with {0,1}. And if I remove {0,1} the regex returns me it's expected value but only in this particular case.

What's wrong to my regex?