How do I find consecutive repeating numbers in my pandas column?-CodePudding

I have two columns, one contains a string of numbers and one contains a two or three digits, as below:

    Account number     
0   5493455646944        
1   56998884221          
2   95853255555926       
3   5055555555495718323  
4   56999998247361       
5   6506569568

I would like to create a regex function which displays a flag if the account number contains more 5 or more consecutive, repeated numbers.

So in theory, the target state is as follows:

    Account number     test
0   5493455646944        No
1   56998884221          No
2   95853255555926       Yes
3   5055555555495718323  Yes
4   56999998247361       Yes
5   6506569568           No

I was thinking something like:

def reg_finder(x):
    return re.findall('^([0-9])\1{5,}$', x)

I am not good with regex at all so unsure...thanks

Edit: this is what I tried:

def reg_finder(x):
    return re.findall('\b(\d)\1 \b', x)

example_df['test'] = example_df['Account number'].apply(reg_finder)

    Account number      test
0   5493455646944        []
1   56998884221          []
2   95853255555926       []
3   5055555555495718323  []
4   56999998247361       []
5   6506569568           []

CodePudding user response：

You can use

import pandas as pd
import warnings
warnings.filterwarnings("ignore", message="This pattern has match groups")

df = pd.DataFrame({'Account number':["5493455646944","56998884221","95853255555926","5055555555495718323","56999998247361","6506569568"]})
df['test'] = "No"
df.loc[df["Account number"].str.contains(r'([0-9])\1{4,}'), 'test'] = "Yes"

Output:

>>> df
        Account number test
0        5493455646944   No
1          56998884221   No
2       95853255555926  Yes
3  5055555555495718323  Yes
4       56999998247361  Yes
5           6506569568   No

Note that r'([0-9])\1{4,}' regex is defined with a raw string literal where backslashes are parsed as literal backslashes, and not string escape sequence auxiliary chars.