# If you'd like to omit non-matching lines from the result; add ';d' to the end of the expression.
sed -E 's/([+0]?[06]?)(?&sep)(36)?(?&sep)(?P<aera>1|[2-9][0-9])(?&sep)(?P<num>\d{3})(?&sep)(\d{2})(?'sep'[\)\(-\\/\.x ]*){2}/$3$4$5$6/ig;t' <<< "+36 20 800 8848
36 1 267-5260
+36 1 267 5260
+36 24 415 351
06 (24) 415 351
6(1)415 3510
00361-267-5260
0036-1-267-5260
0036-1-267-52-60
208008848
20800 88-48
00 34 800 828
((06)|[\+0]{0,2}\s*36)
[+0]{0,2}(?&sep)36"
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