On Mac OS sed can't replace characters to new lines.
I replaced to tabs in sed, with knowing there were no tab exists as I deleted them before, and then by tr I replaced all tabs by new lines, hopefully in a portable way.
# 3rd sed "s/<\/data>.*$//g" = remove all the data after the data xml element - XML now contains only the content of data xml element
# 4th sed "s/>[ ]*<\([^\/]\)/><\1/g" = remove all spaces between XML tag and XML start tag - XML now contains content of data xml element and is without spaces between end and start xml tags
# 5th sed "s/<domain>//g" = remove all domain xml start tags - XML now contains only <name>...</name><type>...</type><status>...</status> </domain>(next xml domain)
# 6th sed "s/[ ]*<\/domain>/\n/g"= replace all "spaces</domain>" by new line - now we create multiple lines each should contain only <name>...</name><type>...</type><status>...</status>
# 7th sed -n "/<name>\([a-zA-Z0-9_\-\.]\+\)<\/name><type>primary<\/type><status>active<\/status>/p" = remove all non primary or non active domains lines
# 8th sed "s/<name>\([a-zA-Z0-9_\-\.]\+\)<\/name><type>primary<\/type><status>active<\/status>/\1/g" = substitute for domain names only
# 6th sed "s/[ ]*<\/domain>/\t/g" = replace all "spaces</domain>" by tab - now we are preparing to create multiple lines
# 7th th '\011' '\n' = replace all tabs from previous sed (Mac OS change) - now we create multiple lines each should contain only <name>...</name><type>...</type><status>...</status>
# 8th sed -n "/<name>\([a-zA-Z0-9_\-\.]\+\)<\/name><type>primary<\/type><status>active<\/status>/p" = remove all non primary or non active domains lines
# 9th sed "s/<name>\([a-zA-Z0-9_\-\.]\+\)<\/name><type>primary<\/type><status>active<\/status>/\1/g" = substitute for domain names only
for xml_domain in $(echo"${response}"| tr -d '\011\012\015'| sed "s/^.*<data>[ ]*//g"| sed "s/<\/data>.*$//g"| sed "s/>[ ]*<\([^\/]\)/><\1/g"| sed "s/<domain>//g"| sed "s/[ ]*<\/domain>/\n/g"| sed -n "/<name>\([a-zA-Z0-9_\-\.]\+\)<\/name><type>primary<\/type><status>active<\/status>/p"| sed "s/<name>\([a-zA-Z0-9_\-\.]\+\)<\/name><type>primary<\/type><status>active<\/status>/\1/g");do
for xml_domain in $(echo"${response}"| tr -d '\011\012\015'| sed "s/^.*<data>[ ]*//g"| sed "s/<\/data>.*$//g"| sed "s/>[ ]*<\([^\/]\)/><\1/g"| sed "s/<domain>//g"| sed "s/[ ]*<\/domain>/\t/g"| tr '\011''\n'| sed -n "/<name>\([a-zA-Z0-9_\-\.]\+\)<\/name><type>primary<\/type><status>active<\/status>/p"| sed "s/<name>\([a-zA-Z0-9_\-\.]\+\)<\/name><type>primary<\/type><status>active<\/status>/\1/g");do
_debug "Found primary active domain: ${xml_domain}"
# 3rd sed "s/[ ]*<\/data>.*$//g" = remove the end of the xml starting with xml end tag data - XML contains only the content of data xml element and is trimmed
# 4th sed "s/>[ ]*<\([^\/]\)/><\1/g" = remove all spaces between XML tag and XML start tag - XML now contains content of data xml element and is without spaces between end and start xml tags
# 5th sed "s/<row>//g" = remove all row xml start tags - XML now contains rows xml element content and its end tag
# 6th sed "s/[ ]*<\/row>/\n/g" = replace all "spaces</row>" by new line - now we create multiple lines each should contain only single row xml content
# 7th sed -n "/<name>${sub_domain_regex}<\/name>.*<rdtype>TXT<\/rdtype>/p" = remove all non TXT and non name matching row lines - now we have only xml lines with TXT rows matching requested values
# 8th sed "s/^<ID>\([0-9]\+\)<\/ID>.*<rdata>\(.*\)<\/rdata>.*$/\1-\2/" = replace the whole lines to ID-value pairs
# 6th sed "s/[ ]*<\/row>/\t/g" = replace all "spaces</row>" by tab - now we are preparing to create multiple lines
# 7th tr '\011' '\n' = replace all tabs with new lines (Mac OS X hint) - we create multiple lines each should contain only single row xml content
# 8th sed -n "/<name>${sub_domain_regex}<\/name>.*<rdtype>TXT<\/rdtype>/p" = remove all non TXT and non name matching row lines - now we have only xml lines with TXT rows matching requested values
# 9th sed "s/^<ID>\([0-9]\+\)<\/ID>.*<rdata>\(.*\)<\/rdata>.*$/\1-\2/" = replace the whole lines to ID-value pairs
# -- now there are only lines with ID-value but value might contain spaces (BAD FOR FOREACH LOOP) or special characters (BAD FOR REGEX MATCHING)
# 9th grep "${value}" = match only a line containg searched value
# 10th sed "s/^\([0-9]\+\).*$/\1/" = get only ID from the row
# 10th grep "${value}" = match only a line containg searched value
# 11th sed "s/^\([0-9]\+\).*$/\1/" = get only ID from the row
for xml_row in $(echo"${response}"| tr -d '\011\012\015'| sed "s/^.*<data>[ ]*//g"| sed "s/[ ]*<\/data>.*$//g"| sed "s/>[ ]*<\([^\/]\)/><\1/g"| sed "s/<row>//g"| sed "s/[ ]*<\/row>/\n/g"| sed -n "/<name>${sub_domain_regex}<\/name>.*<rdtype>TXT<\/rdtype>/p"| sed "s/^<ID>\([0-9]\+\)<\/ID>.*<rdata>\(.*\)<\/rdata>.*$/\1-\2/"| grep "${value}"| sed "s/^\([0-9]\+\).*$/\1/");do
for xml_row in $(echo"${response}"| tr -d '\011\012\015'| sed "s/^.*<data>[ ]*//g"| sed "s/[ ]*<\/data>.*$//g"| sed "s/>[ ]*<\([^\/]\)/><\1/g"| sed "s/<row>//g"| sed "s/[ ]*<\/row>/\t/g"| tr '\011''\n'| sed -n "/<name>${sub_domain_regex}<\/name>.*<rdtype>TXT<\/rdtype>/p"| sed "s/^<ID>\([0-9]\+\)<\/ID>.*<rdata>\(.*\)<\/rdata>.*$/\1-\2/"| grep "${value}"| sed "s/^\([0-9]\+\).*$/\1/");do
_row_id="${xml_row}"
_info "WEDOS API: Found DNS row id ${_row_id} for domain ${domain}"