@Chris R To match white space use the below regex ID "ID":\s(.*?), \s matches any whitespace character (equal to [\r\n\t\f\v ]). You can validate your regex here regex We need to match whitespaces if we are using extract text processor,don't need to match any whitespace characters if you are using Evaluatejson path processor to extract content and keep it as attribute to the flowfile. ... View more