The following is a regular expression example.  With this example, we want to match any of the following:

 

 x3x   x4x   x5x   x6x   x7x

 

In this case, the integer part of the pattern ranges from 3 to 7.  This would require a regular expression as follows:

x[3-7]x

 

When this is tested in the RegEx Testing Utility which ships with Blade, we can see it matches only the entries we require.

Figure 1

 

This could also be written as:

x[34567]x