Filter a txt file using REGEX or other script / solution

Hello freelancers I have a txt file with many records, each record start with “@article{“ and end with “}” [PLEASE CHECK THE FILE FIRST, before BIDDING) And each record has a line called keywords, example: Keywords = {{IT architect; Enterprise architect; word1 AAA BA word2; E-Commerce architect; Digital architect; TOGAF; IT-business alignment}}, And I need to create two solutions or two options: 1. KEEP all records with keyword “AAA BA”, deleting the remaining articles (without that “AAA BA” keyword) but keeping the remaining keywords. 2. KEEP all records with keyword “AAA BA”, deleting the remaining keywords and articles (without the keyword “AAA BA”) The “AAA BA”, can be in the beginning, middle or end of the KEYWORDS sentence. Example, option 2 (deleting the other keywords). Keywords = {{IT architect; Enterprise architect; word1 AAA BA word2; E-Commerce architect; Digital architect; TOGAF; IT-business alignment}}, Result= Keywords = {{word1 AAA BA word2}}, Keywords = {{word1 AAA BA word2; IT architect; Enterprise architect; E-Commerce architect; Digital architect; TOGAF; IT-business alignment}}, Keywords = {{word1 AAA BA word2}}, Keywords = {{IT architect; Enterprise architect; E-Commerce architect; Digital architect; TOGAF; IT-business alignment; word1 AAA BA word2}}, Keywords = {{word1 AAA BA word2}}, Keywords = {{IT architect; Enterprise architect; preAAA BA; E-Commerce architect; Digital architect; TOGAF; IT-business alignment}}, Keywords = {{preAAA BA}}, Keywords = {{preAAA BA; IT architect; Enterprise architect; E-Commerce architect; Digital architect; TOGAF; IT-business alignment}}, Keywords = {{preAAA BA}}, Keywords = {{IT architect; Enterprise architect; E-Commerce architect; Digital architect; TOGAF; IT-business alignment; preAAA BA}}, Keywords = {{preAAA BA}}, Keywords = {{IT architect; Enterprise architect; AAA BAsuf; E-Commerce architect; Digital architect; TOGAF; IT-business alignment}}, Keywords = {{AAA BAsuf}}, Keywords = {{AAA BAsuf; IT architect; Enterprise architect; E-Commerce architect; Digital architect; TOGAF; IT-business alignment}}, Keywords = {{AAA BAsuf}}, Keywords = {{IT architect; Enterprise architect; E-Commerce architect; Digital architect; TOGAF; IT-business alignment; AAA BAsuf}}, Keywords = {{AAA BAsuf}}, Keywords = {{IT architect; Enterprise architect; preAAA BAsuf; E-Commerce architect; Digital architect; TOGAF; IT-business alignment}}, Keywords = {{preAAA BAsuf}}, Keywords = {{preAAA BAsuf; IT architect; Enterprise architect; E-Commerce architect; Digital architect; TOGAF; IT-business alignment}}, Keywords = {{preAAA BAsuf}}, Keywords = {{IT architect; Enterprise architect; E-Commerce architect; Digital architect; TOGAF; IT-business alignment; preAAA BAsuf}}, Keywords = {{preAAA BAsuf}}, In the end: save the filter file, as new. Before bidding please check the file! Good bids