How to filter a SQL query on a substring

I currently have the following inelegant filter hard-coded into my query. Rather than hard-coding dates into the query, I'd like to filter based on a substring, i.e. if the last four characters are 09 or 10 or 11 or 12. How can I do this?

and COURSE_START_DATE in ('201209','201210','201211','201212','201309','201310','201311','201312','201409','201410','201411','201412')

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mariitaAsked:
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slightwv (䄆 Netminder) Commented:
>> if the last four characters are 09
Last four or last two?

Try this:
and regexp_like(COURSE_START_DATE,'(09|10|11|12)$')
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slightwv (䄆 Netminder) Commented:
or
and substr(COURSE_START_DATE,-2,2) in ('09','10','11','12')
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mariitaAuthor Commented:
Last two. Thanks!
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