String-functions

The string-functions are statically bound to namespace "string". The root-namespace is "core:string".
Function signature and description
Examples of function usage
string:contains(StringType) <BooleanType>

Scans the input string for the substring searched for and returns boolean-value, whether the value was found or not.
From json:"Foo-Bar"
Select @ => string:contains("o-B")

#> true
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