如果可以删除所有结尾的破折号，请使用修剪功能；如果仅需要删除最后的破折号，请使用regexp_replace。修剪可能比regexp_replace更好。

with strings as
(
    select 'sdfs-dfg4t-etze45z5z-' as string union all
    select 'sdfs-dfg4t-etze45z5z--' as string union all
    select 'gsdhfhsfh-rgertggh'
)
select
    string,
    trim(trailing '-' from string) as all_trimmed,
    regexp_replace(string, '-$', '') as one_trimmed
from
    strings

结果：

string                  all_trimmed           one_trimmed
sdfs-dfg4t-etze45z5z-   sdfs-dfg4t-etze45z5z  sdfs-dfg4t-etze45z5z
sdfs-dfg4t-etze45z5z--  sdfs-dfg4t-etze45z5z  sdfs-dfg4t-etze45z5z-
gsdhfhsfh-rgertggh      gsdhfhsfh-rgertggh    gsdhfhsfh-rgertggh