bash: Use regular expression to replace part of a variable value.

[hoodedvul]

Take into account the main readme for this section. README first.

Syntax is:
${name/pattern/string} replace first match of pattern with string.

Here we replace the "Less" part of LessDeforestation with 2021

$ echo $ClimateChange
LessDeforestation
$ Amazon=${ClimateChange/Less/2021}
$ echo $Amazon
2021Deforestation