You need to use GREP searches, not text searches. Your post suggests that you're not familiar with GREP, and you could do yourself no bigger favout than learning some basics. Try this search pattern in the GREp tab of the Find/Change dialog:
150\d+?-\d+
\d stands for 'digit', + stands for 'one or more', so \d+ stands for 'one or more digits', i.e. any number. The question mark stands for 'shortest match' -- you'll have to read up on that yourself.
In a script you would use this:
app.findGrepPreferences.findWhat = /150\d+?-\d+/.source
Peter