This sounds to me as if you want to perform a "natural sort" on your data. The usual idea is to either pad out the numbers in your text to a fixed maximum size or to compare the numbers numerically. There have been lots of nodes on this so I won't write any code but will point you to the resources available on the topic:

• Natural sorting
• How do I do a natural sort on an array?
• [ Natural Sort ]: Sorting a string with numbers