Terraform: Extra characters after the end of the ‘for’ expression

Update:

The correct syntax is:

 cidrList = [ for j in local.ipList: 
              length(regexall("/", j)) <= 0 ? "${j}/32" : j ]

but you are using double :, instead of ? and ‘:’.

Previous answer

Not sure what exactly are you trying to achieve, it seems to be that you are after something as follows:

 cidrList = [ for j in local.ipList: 
              {"${j}/32" : j } if length(regexall("/", j)) <= 0  ]

which would give:

[
  {
    "103.77.234.74/32" = "103.77.234.74"
  },
]

or

 cidrList = [ for j in local.ipList: 
              "${j}/32" if length(regexall("/", j)) <= 0  ]

which gives:

[
  "103.77.234.74/32",
]