How to get the starting position of a string match in str.contains() in polar coordinates?

Question content

I know I can use str.contains() to check if a column contains a string, for example:

import polars as pl
df = pl.dataframe({"a": ["my name is bob","my little pony, my little pony"]})
(df.with_columns(bbb = pl.col('a').str.slice(1,10000).str.contains(pl.col('a').str.slice(0,10), literal=true)
                  )
 )

What I want is the exact starting position of the race, not just a boolean like:

import re
x = re.search(r"pony","my little pony")
print(x.start(),x.end())

How can I do this?

Correct answer

You can use series.str.find()Method:

import polars as pl
df = pl.DataFrame({"a": ["my name is Bob","my little pony, my little pony"]})
df.with_columns(
    bbb=pl.col('a').str.slice(1,10000).str.find(
            pl.col('a').str.slice(0,10), literal=True)
        )
 )

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