Can Not Match regular expression like: `(\S*)\.log$` "Desc" without A

[zhouhuiquan]

Version: 0.2.8 with A is OK

snippet `(\S*)\.log` "Desc"  A
xxxxxx
endsnippet

no log without A is OK

snippet `(\S*)\.` "Desc" 
xxxxxx
endsnippet

has log and without A is NOT OK

snippet `(\S*)\.log` "Desc"  
xxxxxx
endsnippet