如何在极坐标上获取 str.contains() 中的字符串匹配起始位置？

import polars as pldf = 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)                  ) )

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

import polars as pldf = 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)        ) )