split python string on multiple string delimiters efficiently <p>Suppose I have a string such as <code>"Let's split this string into many small ones"</code> and I want to split it on <code>this</code>, <code>into</code> and <code>ones</code></p> <p>such that the output looks something like this:</p> <pre><code>["Let's split", "this string", "into many small", "ones"] </code></pre> <p>What is the most efficient way to do it?</p>