This means there is something wrong with your regex vs what Java supports. Do you mean "(?:" rather than "(?" around where the error is? This is not related to Spark.
On Wed, Dec 2, 2020 at 9:45 AM Sachit Murarka <connectsac...@gmail.com> wrote: > Hi Sean, > > Thanks for quick response! > > I have tried with string literal 'r' as a prefix that also gave an empty > result.. > spark.sql(r"select regexp_extract('[11] [22] > [33]','(^\[OrderID:\s)?(?(1).*\]\s\[UniqueID:\s([a-z0-9A-Z]*)\].*|\[.*\]\s\[([a-z0-9A-Z]*)\].*)',1) > as anyid").show() > > and as I mentioned when I am using 2 backslashes it is giving an exception > as follows: > : java.util.regex.PatternSyntaxException: Unknown inline modifier near > index 21 > > (^\[OrderID:\s)?(?(1).*\]\s\[UniqueID:\s([a-z0-9A-Z]*)\].*|\[.*\]\s\[([a-z0-9A-Z]*)\].*) > > Kind Regards, > Sachit Murarka > > > On Wed, Dec 2, 2020 at 9:07 PM Sean Owen <sro...@gmail.com> wrote: > >> As in Java/Scala, in Python you'll need to escape the backslashes with >> \\. "\[" means just "[" in a string. I think you could also prefix the >> string literal with 'r' to disable Python's handling of escapes. >> >> On Wed, Dec 2, 2020 at 9:34 AM Sachit Murarka <connectsac...@gmail.com> >> wrote: >> >>> Hi All, >>> >>> I am using Pyspark to get the value from a column on basis of regex. >>> >>> Following is the regex which I am using: >>> >>> (^\[OrderID:\s)?(?(1).*\]\s\[UniqueID:\s([a-z0-9A-Z]*)\].*|\[.*\]\s\[([a-z0-9A-Z]*)\].*) >>> >>> df = spark.createDataFrame([("[1234] [3333] [4444] [66]",), >>> ("abcd",)],["stringValue"]) >>> >>> result = df.withColumn('extracted value', >>> F.regexp_extract(F.col('stringValue'), >>> '(^\[OrderID:\s)?(?(1).*\]\s\[UniqueID:\s([a-z0-9A-Z]*)\].*|\[.*\]\s\[([a-z0-9A-Z]*)\].*)', >>> 1)) >>> >>> I have tried with spark.sql as well. It is giving empty output. >>> >>> I have tested this regex , it is working fine on an online regextester . >>> But it is not working in spark . I know spark needs Java based regex , >>> hence I tried escaping also , that gave exception: >>> : java.util.regex.PatternSyntaxException: Unknown inline modifier near >>> index 21 >>> >>> (^\[OrderID:\s)?(?(1).*\]\s\[UniqueID:\s([a-z0-9A-Z]*)\].*|\[.*\]\s\[([a-z0-9A-Z]*)\].*) >>> >>> >>> Can you please help here? >>> >>> Kind Regards, >>> Sachit Murarka >>> >>