Could I do a starts_with comparison for a string with a list of strings, return True if the string starts with any of the strings in the list, this is what I come up with,

df = pl.DataFrame({'a': ['https://abcd.com', 'https://youtube.com'], 
                   'validation_urls': [['https://abcd.com', 'https://efgh.com'], 
                                       ['https://abcd.com', 'https://efgh.com']]})

df = df.with_columns(is_valid=pl.col('a').str.starts_with(pl.col('validation_urls').explode()))

┌─────────────────────┬──────────────────────────────────────────┬──────────┐
│ a                   ┆ validation_urls                          ┆ is_valid │
│ ---                 ┆ ---                                      ┆ ---      │
│ str                 ┆ list[str]                                ┆ bool     │
╞═════════════════════╪══════════════════════════════════════════╪══════════╡
│ https://abcd.com    ┆ ["https://abcd.com", "https://efgh.com"] ┆ true     │
│ https://youtube.com ┆ ["https://abcd.com", "https://efgh.com"] ┆ false    │
└─────────────────────┴──────────────────────────────────────────┴──────────┘

but not sure if this is the ideal way to do this check.