Find most similar

[it-is-hacker-time]

What algoritm should I use to find the closest match from a string to a set of strings.

Example of known inputs:

I would like a cheese pizza
I would like a cheese pizza with onions
I would like a cheese pizza without onions

Input I wanna match up and find most similiar, in case there are any similar (in this example there are just spelling mistakes):

I would like a ceese pizza with out onnions.