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i have a text box that i enter a range to in a string format, the text in the text box is something like
“1 to 30”
“4 to 75”
so its integer &” to “& integer.
what is the best way to validate this?
This is a perfect task for regular expressions. In your case, the expression is as easy as
Which means:
^),\dis a digit, the following+means: one or more of the previous),\sis spaces, tabs etc.),to,$).In VB, you’d match it as follows:
This requires importing the
System.Text.RegularExpressionsnamespace.Regular expressions are an own language to describe strings, so they take a bit getting used to. But they are by far the easiest tool to handle such string validations and simple parsing jobs so learning them is obligatory.