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workaround for unknown '--' argument while calling 'expr' from BusyBox
- a patch will be suggested to the BusyBox mailing list to skip the 'end of options' marker according to POSIX specifications, if it's the first argument to 'expr' - this problem may be solved with additional parentheses around the regexp match, too - this way the string with unknown contents as arg1 can't be misinterpreted as an option
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