regex - expr match problem in shell -

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in sh shell script wrote following: 

opr=+   echo `expr match "$opr" '[+\-x/]'`

but error when ran: 

expr: syntax error

what doing wrong? same error when make opr equal - , / .

another interesting thing found when wrote this: 

opr=a   echo `expr match "$opr" '[+\-x/]'`

it returns this: 

1

this means matched string "a" 1 of +, -, x, , /. makes no sense!

first case: +

+ has special meaning expr:

   + token           interpret token string, if           keyword `match' or operator `/'

second case: a

your regexp range operation, matching characters + x, includes alnums. make - matched literally in charclass, must first or last character; backslashing doesn't work.


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