Expr.str.extract

methodView source ↗

def extract(pattern: IntoExprColumn, group_index: int = 1) -> Expr

Categories: string

Extract a pattern from the string.

Parameters

parameter

pattern

The pattern to extract.

parameter

group_index

The group index to extract.

Examples

>>> import tabsdata as td
>>>
>>> tf: td.TableFrame ...
>>>
>>> tf.select(td.col("a"), td.col("a").str.extract("(b.b)", 1).alias("extract"))
>>>
┌───────────┬─────────┐
│ a         ┆ extract │
│ ---       ┆ ---     │
│ str       ┆ str     │
╞═══════════╪═════════╡
│ a bAb c d ┆ bAb     │
│ bCbb c d  ┆ bCb     │
│ bb        ┆ null    │
│ null      ┆ null    │
└───────────┴─────────┘