Function subst::substitute

pub fn substitute<'a, M>(
    source: &str,
    variables: &'a M
) -> Result<String, Error>where
    M: VariableMap<'a> + ?Sized,
    M::Value: AsRef<str>,

Substitute variables in a string.

Variables have the form $NAME, ${NAME} or ${NAME:default}. A variable name can only consist of ASCII letters, digits and underscores. They are allowed to start with numbers.

You can escape dollar signs, backslashes, colons and braces with a backslash.

You can pass either a HashMap, BTreeMap or Env as the variables parameter. The maps must have &str or String keys, and the values must be AsRef<str>.