Hi, is this a bug?

freeswitch@internal> regex "10"|"09|10"
false
freeswitch@internal> regex "10"|"10"
true
freeswitch@internal> regex "10"|"(09|10)"
false
freeswitch@internal> 2009-09-27 11:47:00.815355 [ERR] switch_regex.c:101 COMPILE ERROR: 4 [missing )]["(09]

the first one should be true?