bash - Regex square close bracket -


i can use bash match set of characters

$ [[ =~ [abc] ]]; echo $? 0

however if want close square bracket ] included in set, fails

$ [[ =~ [abc\]] ]]; echo $? 1  $ [[ =~ [abc\\]] ]]; echo $? 1

from man page regex(7):

to include literal ']' in list, make first character (fol- lowing possible '^').

testing:

$ [[ "]" =~ []abc] ]]; echo $? 0

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