i need to replace "stringA" with "stringAstringB"

[jx2]

lets say i've got a str="john michael luise+marry"
i need to replace all ocurrance of name with name+surname
eg str2= "johnBrown michealBrown luiseBrown+marr yBrown"

i gues i need something like this str.replace and \[a-z]+\
but... i have no idea how to do it

could you help me?
regards
jx2

[jx2]

lol thanks guys but i was quicker :-)
dola$$$$ made my day
str.replace(/([a-z]+)/g,"$1"+name)

:-)