Regex functionality on String

Rails
1

This is my partially string

*** HOLE CARDS ***
gogo1978: calls $0.15
istackdoe: checks
*** FLOP *** [5d Qd 2c]
istackdoe: checks
gogo1978: checks
*** TURN *** [5d Qd 2c] [Ah]
istackdoe: checks
gogo1978: checks
*** RIVER *** [5d Qd 2c Ah] [6s]
istackdoe: checks
gogo1978: checks
*** SHOW DOWN ***
istackdoe: shows [9h 2h] (a pair of Deuces)
gogo1978: mucks hand

I need output

*** HOLE CARDS ***
Call gogo1978, $0.15
Check istackdoe:
*** FLOP *** [5d Qd 2c]
Check istackdoe:
Check gogo1978:
*** TURN *** [5d Qd 2c] [Ah]
Check istackdoe:
Check gogo1978:
*** RIVER *** [5d Qd 2c Ah] [6s]
Check istackdoe:
Check gogo1978:
*** SHOW DOWN ***
Show istackdoe: [9h 2h] (a pair of Deuces)
gogo1978: mucks hand

There is possibility that istackdoe and gogo1978 not be fixed everytime
means it will be different name in another string

Thanks…