[DOC] Incomplete explanation about the regex =~ operator

[gilaro]

The shell operation mentioned in the Bash Reference Manual (3.1.1 Shell 
Operation) does not match the operation defined for the conditional expression 
"[[" when using a regular expression (3.2.4.2 Conditional Constructs). The 
corresponding explanation is only presented in the Bash FAQ (Why does quoting 
the regular expression matching conditional operator (=~) cause regex matching 
to stop working?). Moreover, this explanation is unclear; it lacks concrete 
examples.
See also: Does bash support word boundary regular expressions?

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Does bash support word boundary regular expressions?

I am trying to match on the presence of a word in a list before adding that 
word again (to avoid duplicates). I ...
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Best regards,Kevin