It's interesting Amber doesn't seem to be leveraging Bash-native Regexes via:
if [[ "${foo}" =~ ^someReg[e][x][p][r]$ ]]; then ...
What value exists in going to such great lengths to target super old and anqtiquated versions of Bash? It becomes very limiting for this poor new language :-s
Maybe still just the earliest of early days? Javascript-style RegExs along the lines of: