Restricting text box inputs to a given regexp using jQuery

Question

Consider the following text box:

Using jQuery I want to restrict the

Answer 1

Not an answer to your question (since I have no knowledge of jQuery), but the regex ^[1-9]*[0-9]*$ might not do as you expect or think. It matches empty strings but also a number like 000000. I expect that you don't want that since your first character class [1-9] explicitly ignores the zero. I think you should change the first * into a +: ^[1-9]+[0-9]*$. However, that regex will reject the (single) number 0. If you want to include that, you should do: ^(0|[1-9]+[0-9]*)$.