regex - Regular expression to fetch lines evaluating only one part of a string, java -

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i'm trying find regular expression match part of pattern

for example text :

goodclass.nicemethod badclass.nicemethod badclass2.nicemethod verybadclass.nicemethod goodclass.nicemethod badclass.nicemethod badclass2.nicemethod goodclass.nicemethod

how can lines 'nicemethod' not follow 'goodclass'

you can use negative lookbehind:

string regex = "(?<!goodclass\\.)\\bnicemethod\\b";

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