bash: Use regular expression to replace all patterns in a variable value.

[hoodedvul]

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

Syntax is:
${name//pattern/string} replace all matches of pattern with string.

$ echo $ClimateChange
2021NoDeforestation2021
$ Amazon=${ClimateChange//2021/2025}
$ echo $Amazon
2025NoDeforestation2025