returns the string instead of groups for re_search function if there is no any group specified

[peonone]

It's a very common use case that extracts the number from a string, like 4.3 from 4.3 out of 5 stars.

For example, for this input ["4.3 aa", "2.6 bb"], we want to extract a result as ["4.3", "2.6"] but we don't have a quick way to do it.

re_search("([0-9.]+)")|first does not work, as first takes the first row of the output, not a list of the first group, so we will get ('4.3',)

My proposal is to return a string instead of the groups, if no any group specified, then we will get the expected result by re_search("[0-9.]+")

[Gallaecio]

It may be worth allowing commas as well, both because they are decimal separators in some languages and because they are thousand separators in other languages, including English.