英文:
Polars replace_all() Refer To Capture Groups In Replacement
问题
如何在 polars 的 replace_all 方法中引用捕获组之一以用于替换字符串？例如，我想将 "5m" 替换为 "5 metres"。在 Postgres 中，我可以这样做：
select regexp_replace(text_col, '(\d+)m ', '\1 metres ')from my_table
在 polars 中如何实现相同的功能？
英文:
How do I refer to one of the capture groups in polars replace_all method in the replacement string? For example I want to replace "5m" with "5 metres". In Postgres I can do this:
select regexp_replace(text_col, '(\d+)m ', ' metres ')from my_table
How could I achieve the same thing in polars?
答案1
得分: 2
你可以使用美元符号 $ 来引用捕获组。
支持的语法来自 regex crate 文档：https://docs.rs/regex/latest/regex/
pl.Series(["214365"]).str.replace_all(r"(.)(.)", "$2$1")
shape: (1,)Series: '' [str]["123456"]
命名捕获组示例：
pl.Series(["214365"]).str.replace_all(r"(?P<left>.)(?P<right>.)", "$right$left")
shape: (1,)Series: '' [str]["123456"]
英文:
You can use the dollar sign $ to refer to capture groups.
The supported syntax is from the regex crate: https://docs.rs/regex/latest/regex/
pl.Series(["214365"]).str.replace_all(r"(.)(.)", "$2$1")
shape: (1,)Series: '' [str]["123456"]
named capture groups example:
pl.Series(["214365"]).str.replace_all(r"(?<left>.)(?<right>.)", "$right$left")
shape: (1,)Series: '' [str]["123456"]
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