I tested regular expression using view result tree, it returns correct data(30 match results). i used reference name in regular expression extractor as regexid. Regular expression i used is \d{7} ${regexid} has value equals null. cross checked in debug sampler. it has below info regexid=null regexid_g=0 regexid_g0=6104546
Why regexid has null value, when there were 30 matches for this regular expression
Template value - $1$ and for match number i tried using 1,2,0,-1 but i still get null value
