regex101: Python Match Workspace

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^AB ([\s\S]*?)(?=\n[A-Z]{2}\s)

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TI TEST TEST TEST TEST TEST TEST TEST TEST AJSAOISJAO SOAI
   ASASPAOS
SO EITCHA EITCHA EITCHA EITCHA EITCHA EITCHA EITCHA EITCHA 
AB Purpose
   To examine the evidence supporting the use of simulation-based assessments as surrogates for patient-related outcomes assessed in the workplace.
   Method
   The authors systematically searched MEDLINE, EMBASE, Scopus, and key journals through February 26, 2013. They included original studies that assessed health professionals and trainees using simulation and then linked those scores with patient-related outcomes assessed in the workplace. Two reviewers independently extracted information on participants, tasks, validity evidence, study quality, patent-related and simulation-based outcomes, and magnitude of correlation. All correlations were pooled using random-effects meta-analysis.
   Results
   Of 11,628 potentially relevant articles, the 33 included studies enrolled 1,203 participants, including postgraduate physicians (n = 24 studies), p