hledger-flow: lib_preprocess: allow testing of single / multiple columns

container/src/hledger-flow/lib/lib_preprocess.bash

@@ -2,7 +2,7 @@
 
 # docker-finance | modern accounting for the power-user
 #
-# Copyright (C) 2021-2024 Aaron Fiore (Founder, Evergreen Crypto LLC)
+# Copyright (C) 2021-2025 Aaron Fiore (Founder, Evergreen Crypto LLC)
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -60,13 +60,13 @@ echo -e "    \e[32m├─\e[34m\e[1;3m ${global_account}/${global_subaccount}\e[
 echo -e "    \e[32m│  └─\e[34;3m ${global_year}\e[0m"
 echo -e "    \e[32m│     └─\e[37;2m ${global_in_filename}\e[0m"
 
-# Search for column in given CSV header
+# Test if column(s) exist in given CSV header
 function lib_preprocess::test_header()
 {
   local _column="$1"
   local _header
   _header="$(lib_preprocess::__sanitize_header $2)"
-  [[ "$_header" =~ (^${_column},|,${_column},|,${_column}$) ]] && return 0 || return 2
+  [[ "$_header" =~ (^${_column}$|^${_column},|,${_column},|,${_column}$) ]] && return 0 || return 2
 }
 
 # Assert header in given CSV header