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link管理  ›  regexp_count function | Databricks on AWS
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https://docs.databricks.com/en/sql/language-manual/functions/regexp_count.html
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    • regexp_count function

    Applies to: check marked yes Databricks SQL check marked yes Databricks Runtime 11.2 and above

    Returns the number of times str matches the regexp pattern.

    Syntax 

    regexp_count( str, regexp )

    An INTEGER.
    

    The regexp string must be a Java regular expression.
String literals are unescaped. For example, to match '\abc', a regular expression for regexp can be '^\\abc$'.
    

    In case of a malformed regexp the function returns an INVALID_PARAMETER_VALUE error.
    

    If either argument is NULL the result is NULL.
    

    Examples 
    

    > SELECT regexp_count('Steven Jones and Stephen Smith are the best players', 'Ste(v|ph)en');
> SELECT regexp_count('Mary had a little lamb', 'Ste(v|ph)en');
> SELECT regexp_count(NULL, 'Ste(v|ph)en');
> SELECT regexp_instr('Mary had a little lamb', NULL);
     
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