Not to stress to you, but ( dot , ... ) :

PrefixChars = "., "
if  right(mytext, len('xxx'))==lower('xxx') and LEFT(RIGHT(mytext,1+len('xxx')),1) $ m.PrefixChars
    * do it again
endif

In general, for a set of prefix chars and a set of suffix chars,
a complex matching machine is need.

With only, space separators this task is more simple.