import re
 
sss = ['AB.224-QW-2018', 'AB.876-5-LS-2018', 'AB.26-LS-18', 'AB-123-6-LS-2017', 'IA-Mb-22L-AB.224-QW-2018-IA-Mb-22L',
       'ZX-ss-12L-AB-123-6-LS-2017-BC-22', 'AB.224-2018', 'AB.224/QW/2018', 'AB/224/2018',
       'AB-10-HDB-231-NCLT-1-2017 AD-42-HH-2019', 'AB-1-HDB-NCLT-1-2016 AD-42-HH-2020',
       'AB-1-HDB-NCLT-1-2016/(AD-42-HH-2020)']
 
pattern = r"(AB)\D*(\d+)\S*?(\d\d)\b(?=\s|[,'/]|-[A-Z]{2}\b|$)"
for s in sss:
    m = re.search(pattern, s)
    if m:
        b = m.group(1) + "/" + m.group(2) + "/" + m.group(3)
        print(b)
    else:
        print('No Match:' + s)

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