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From Sean Owen <sro...@gmail.com>
Subject Re: Regexp_extract not giving correct output
Date Wed, 02 Dec 2020 15:57:14 GMT
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 <connectsachit@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 <srowen@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 <connectsachit@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
>>>
>>

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