Returns the substring of string before the first occurrence of searchString, excluding
searchString.
If searchString is not found, the whole string will be returned.
Parameters
string: string
searchString: string
caseSensitive: boolean = true
If true (default) the search will be case-sensitive.
Returns the substring of string before the first occurrence of searchString, excluding searchString. If searchString is not found, the whole string will be returned.