REGEXP_EXTRACT in Google Data Studio; Keep Getting 'Null'

Question

I am creating reports in Google\'s Data Studio, and I have successfully created several custom dimensions in the past using REGEXP_MATCH on the Keyword

Answer 1

Mind that in order to extract any text from REGEXP_EXTRACT, you should define a capturing group inside the regex pattern. In short, enclose the part you need to extract with a pair of unescaped parentheses.

Now, to match img at the start of the string you need to use ^ anchor, it matches the start of a string position.

To match 1 or more chars, use +.

So, you may use any of the following depending on your actual rules:

REGEXP_EXTRACT(Keyword, '^img ([a-zA-Z0-9_]+)')
REGEXP_EXTRACT(Keyword, '^img\\s+(\\w+)')
REGEXP_EXTRACT(Keyword, '^img\\s+(.+)')

Details

• ^ - start of string
• img - a literal substring
• ([a-zA-Z0-9_]+) - Capturing group 1: one or more letters, digits or _
• \s+ - 1 or more whitespaces
• \w+ - 1 or more word chars: letters, digits or _
• .+ - 1 or more chars other than line break chars.