If you have enough memory:
S = fileread('YourFileNameHere.txt');
selected = regexp('^.*<fieldname\s*=.*$', 'match', 'dotexceptnewline', 'lineanchors');
And in the case where you do not care what is at the begining or end of line and just want to know what the "data" field content is, then
S = fileread('YourFileNameHere.txt');
datas = regexp('(?<=fieldname\s*=")(?<data>[^"]*)', 'tokens');
That should get you a struct array with field name 'data' that is the content of inside the quotes.
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