How to get only the dates near keyword using regex-CodePudding

import re
s = """Sentence 1: Admit on TOM, SINI [STOM] Dismissal Date: 07/20/2021
    Sentence 2: Admit 08/07/2021 TOM, SINI [STOM]
    Sentence 3: Adm: 09/07/2018 TOM, SINI [STOM]"""

admission_keys = ['Admit','Adm:']
date_patterns = ['\d{2}/\d{2}/\d{4}','\d{1,2}[-]\d{1,2}[-]\d{2,4}']
pattern = re.findall(r"(?:(?:"   '|'.join(admission_keys)    ").*?(?:"   '|'.join(date_patterns)   '))',s)
print(pattern)

Required solution: Admit 08/07/2021,Adm: 09/07/2018

The solution is taking "Admit on TOM, SINI [STOM] Dismissal Date: 07/20/2021". Is there any solution that gets only near Admit.

CodePudding user response：

Here you go:

import re


admission_keys = ['Admit','Adm:']
date_patterns = ['\d{2}/\d{2}/\d{4}', '\d{1,2}[-]\d{1,2}[-]\d{2,4}']

adm_pattern = "|".join(admission_keys)
date_pattern = "|".join(date_patterns)
pattern = re.compile(rf"((?:{adm_pattern}) (?:{date_pattern}))")

s = """
Sentence 1: Admit on TOM, SINI [STOM] Dismissal Date: 07/20/2021
Sentence 2: Admit 08/07/2021 TOM, SINI [STOM]
Sentence 3: Adm: 09/07/2018 TOM, SINI [STOM]
Sentence 4: Adm: 4-12-2014
Sentence 5: Admit 05-25-16
"""

pattern.findall(s)
# ['Admit 08/07/2021', 'Adm: 09/07/2018', 'Adm: 4-12-2014', 'Admit 05-25-16']