Hello I’m trying to check if string_1 = 'this example string' contains a column value as a substring.

For example the first value in Col B should be True since 'example' is a substring of string_1

string_1 = 'this example string'

┌──────────────────┬───────────────┬────────────┐
│      Col A       ┆    Col B      ┆   Col C    │
│ ---              ┆ ---           ┆ ---        │
│ str              ┆ str           ┆ str        │
╞══════════════════╪═══════════════╪════════════╡
│ 448220           ┆ example       ┆ 7101936801 │
│ 518398           ┆ 99999         ┆ 9999900091 │
│ 557232           ┆ 424570        ┆ 4245742060 │ 
└──────────────────┴───────────────┴────────────┘

This is what I have tried so far but it’s returning the following error:

df=df.with_columns([(pl.col("Col B").apply(lambda x: x in string_1).alias('new_col'))])

AttributeError: 'Expr' object has no attribute 'apply'