How to add a limited number of spaces to a regular expression (.htaccess)?

Question

Regular Expressions

.htaccess:

RewriteRule ^text/([абвгдеёжзийклмнопрстуфхцчшщьыъэюяАБВГДЕЁЖЗИЙКЛМНОПРСТУФХЦЧШЩЬЫЪЭЮЯ\ {0,1}]+)?$ /app/text/detail.php?t=$1 [L]

Must process url: test%20test (<= 1 space)
And must not process: test%20%20test (> 1 space)

Answer 1

RewriteRule ^text/((\xd0[\x81\x90-\xbf]|\xd1[\x80-\x91])+(?:\s(?2)+)*)/?$ /app/text/detail.php?t=$1 [L]