returns the substring before the specified expression
None
None
If the string specified as the first argument contains the expression specified as the second argument, the substring before the first match of the expression is returned.
If the string does not contain the expression then the empty string is returned.
An optional third argument can be used to match the nth occurence of the specified expression. If this value is negative then -1 means the last occurrence, -2 means the next-to-last occurence and so on.
| std::truncate_from | returns the substring before the specified expression |
| std::between | returns the substring between the two specified expressions |
| std::behind | returns the substring behind the specified expression |
| std::from | returns the substring starting with the specified expression |
| std::until | returns the substring ending with the specified expression |
| std_types::string | returns the substring before the specified expression |