PCRE regex to sed regex -

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first of sorry bad english. i'm german guy.

the code given below working fine in php:

$string = preg_replace('/href="(.*?)(\.|\,)"/i','href="$1"',$string);

now t need same sed. thought should be:

sed 's/href="(.*?)(\.|\,)"/href="{$\1}"/g' test.htm

but gives me error:

sed: -e expression #1, char 36: invalid reference \1 on `s' command's rhs

sed -e 's|href=\"\(.[^"][^>]*\)\([.,]\)\">|href="\1">|g' file

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