'how to extract data from unstructured text (pdf)

i have unstructured data texte contain information i want to extract for example ihave this text "They have obtained an accuracy of 97 % in detection of DDoS attack which is not high than already existing schemes" and the sort will be like this "accuracy =97% " i'm all ready doing an preprocessing for my text & i'm trying hard with nltk pipline but no result



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