regex - how to do "or" in substring matching for bash -

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echo `expr "hello" : '\(hi|hello\)'` echo `expr "hi" : '\(hi|hello\)'`

obviously i'm trying match "hello" , "hi" regex hello , hi, neither matches.

how express properly??

alternately, plain globs

case $str in     *hi* | *hello*) echo "pleased meet you" esac

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