+ # * Cooper, Mendel. “Advanced Bash-Scripting Guide: Manipulating Strings”. tldp.org https://tldp.org/LDP/abs/html/string-manipulation.html
+
+ local str_rec pos str_ins re len_str_rec;
+ local pfx_pos_start pfx_len pfx;
+ local sfx_pos_start sfx_len sfx;