grep - What does "[chS]" mean in the regex of this shell command? - 


egrep -r --include "*.[chs]" "myregularexpression" .

what [chs] mean in shell command above?

that part of shell globbing selects multiple files.

the expression [chs] matches single character containing value c, h, or s.

so, glob "*.[chs]" looking files have extension .c, .h, or .s


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