Spark SQL - rlike ignore case

问题

I am using spark SQL and trying to compare a string using rlike it works fine, however would like to understand how to ignore case.

this return true

select "1 Week Ending Jan 14, 2018" rlike "^\\d+ Week Ending [a-z, A-Z]{3} \\d{2}, \\d{4}"

However, this return False,

select "1 Week Ending Jan 14, 2018" rlike "^\\d+ week ending [a-z, A-Z]{3} \\d{2}, \\d{4}"

回答1:

Spark is using the standard Scala regex library, so you can inline the processing flags in the pattern, for example (?i) for case-insensitive:

spark.sql("""select "1 Week Ending Jan 14, 2018" rlike "(?i)^\\d+ week ending [a-z, A-Z]{3} \\d{2}, \\d{4}"""").show()
+--------------------------------------------------------------------------------+
|1 Week Ending Jan 14, 2018 RLIKE (?i)^\d+ week ending [a-z, A-Z]{3} \d{2}, \d{4}|
+--------------------------------------------------------------------------------+
|                                                                            true|
+--------------------------------------------------------------------------------+

来源：https://stackoverflow.com/questions/57118843/spark-sql-rlike-ignore-case