# If you'd like to omit non-matching lines from the result; add ';d' to the end of the expression.
sed -E 's/(49)\(?([0-9]{3})[\)\s\\/]?([0-9]{8})/\1\2\3/gm;t' <<< "+4917112345678
004917112345678
+49171/12345678
0049171 12345678
004312345678"
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for SED, please visit: https://www.gnu.org/software/sed/manual/html_node/The-_0022s_0022-Command.html