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VAR='[[:alpha:]]'
[[ $VAR =~ '[[:alpha:]]' ]] && echo match 1
[[ a =~ '[[:alpha:]]' ]] || echo match 2
[[ a =~ [[:alpha:]] ]] && echo match 3
[[ a =~ $VAR ]] && echo match 4
[[ a =~ "$VAR" ]] || echo match 5
line=aab
[[ $line =~ [[:space:]]*(a)?b ]] && echo match 6
V="alphabet"
[[ $V == alphabet ]] && echo yes 1
[[ $V == "alphabet" ]] && echo yes 2
[[ $V == 'alphabet' ]] && echo yes 3
[[ $V =~ alphabet ]] && echo yes 4
[[ $V =~ "alphabet" ]] && echo yes 5
[[ $V =~ 'alphabet' ]] && echo yes 6
DOG="Dog name - 01 - Wiggles"
REPAT='([[:alpha:][:blank:]]*)- ([[:digit:]]*) - (.*)$'
if [[ $DOG =~ ([[:alpha:][:blank:]]*)-\ ([[:digit:]]*)\ -\ (.*)$ ]]
then
echo Dog ${BASH_REMATCH[2]} is ${BASH_REMATCH[3]}
fi
if [[ $DOG =~ $REPAT ]]
then
echo Dog ${BASH_REMATCH[2]} is ${BASH_REMATCH[3]}
fi
[[ $REPAT =~ "$REPAT" ]] && echo rematch 1
v="one two buckle my shoe"
[[ ${v} =~ "one two" ]] && echo matches 7
[[ ${v} =~ (one two) ]] && echo matches 8
[[ ${v} =~ one\ two ]] && echo matches 9
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