Extracting data using regexp_extract in Google BigQuery

Question

I am trying to extract data from a column which has multiple characters and I am only interested in getting the specific string from the input string. My sample input and outputs are as below. How can I implement this using regexp_extract function.Can someone share their thoughts on this if you have worked on GBQ.Thanks.

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• SQL:-

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   SELECT request.url AS url 
    FROM [xyz.abc]
    WHERE regexp_extract(input,r'he=(.{32})') 

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• Input:-

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http://mpp.xyz.com/conv/v=5;m=1;t=16901;ts=20150516234355;he=5e3152eafc50ed0346df7f10095d07c4;catname=Horoscope  
2   http://mpp.xyz.com/conv/v=5;m=1;t=16901;ts=20150516234335;he=5e3152eafc50ed0346df7f10095d07c4;catname=High+Speed+Internet   

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• Output :-

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5e3152eafc50ed0346df7f10095d07c4
5e3152eafc50ed0346df7f10095d07c4

**

Solution

It's very simple to do:

select regexp_extract(input,r'he=(.{32})');

or as example:

select regexp_extract('http://mpp.xyz.com/conv/v=5;m=1;t=16901;ts=20150516234355;he=5e3152eafc50ed0346df7f10095d07c4;catname=Horoscope',r'he=(.{32})')

Comments

[Teja]

Thanks for the response Pentium. But I get this error when I run the same. Argument type mismatch in function LOGICAL_AND: first argument is type bool, second argument is type string

[Pentium10]

You should check your data types, these work with STRING columns. Share your query if you still have issue to be able to help.

[Pentium10]

That's a confused SQL, you cannot use this way the REGEXP as where. SELECT regexp_extract(request.url,r'he=(.{32})') as output AS url FROM [xyz.abc]

[Teja]

My bad... I removed it from where clause and tried running keeping it in SELECT clause... but it is returning me NULLs.

[Teja]

What does .{32} mean?