# If you'd like to omit non-matching lines from the result; add ';d' to the end of the expression.
sed -E 's/([a-zA-Z\:]){4,100}([a-zA-Z0-9]{8}[:-]([a-zA-Z0-9]{4}[:-]){3}[a-zA-Z0-9]{12})//;t' <<< "urn:vcloud:user:2998042f-b91d-4c16-9de8-7feaf5e711a8
"
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