mysql - Python - Regular Expression to find dates in list -

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while looping through csv i'm attempting normalize dates mysql load (yyyy-mm-dd). i've attempted search items contain 2 forward slashes, i've found that's not unique enough identify date. can accomplished regular expression , looking items match pattern? input appreciated.

example input:

['1','2','01/02/2015','3','4','1-05-2015','5','anot/her ex/ample','6']

example output:

['1','2','2015-01-02','3','4','2015-01-05','5','anot/her ex/ample','6']

if know order of fields. can use datetime.strptime:

from datetime import datetime  l =  ['1','2','01/02/2015','3','4','1-05-2015','5','another ex/ample','6']  out = []  ele in l:     try:         out.append(datetime.strptime(ele,"%d/%m/%y").strftime("%y-%m-%d"))         except valueerror:         out.append(ele)  print(out)

i have no idea how expect '1-05-2015' become '2015-01-05' considering forward slashes dates:

if have multiple patterns test:

out = []  ele in l:     patt in ["%d/%m/%y","%d-%m-%y"]:         try:             p1 = datetime.strptime(ele,patt).strftime("%y-%m-%d")             if p1:                 out.append(p1)                 break         except valueerror e:             print(e)     else:         out.append(ele)  print(out) ['1', '2', '2015-01-02', '3', '4', '2015-01-05', '5', 'anot/her ex/ample', '6']

you can filter on length , try parse correct length strings:

for ele in l:     ln = len(ele)     if 7 <= ln > 10:         out.append(ele)         continue     patt in ["%d/%m/%y", "%d-%m-%y"]:         try:             p1 = datetime.strptime(ele,patt).strftime("%y-%m-%d")             if p1:                 out.append(p1)                 break         except valueerror e:             print(e)     else:         out.append(ele)

a regex potentially going match lot more dates unless 100 percent should @ least try casting regex returns datetime object before adding.


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