Q:

Wildcards in strings

I'm interested in using rangeOfString with some wildcard characters as part of a search string.  
For example, if I have several strings like "244px" and "356px" and I want to convert all such strings to "320px".  Is there a way I can use wildcards to get the desired result?  

A:

If you could use regex, you can do substitution for this pattern "[1-9][0-9]+px" to "320px"

