How to Substring from the last 3rd underscore?

Hi Friends,
I have so many strings like as given below.
PRINT_IB_0_10009473330100_I000001_FILE001_1.txt
I have to substring the value starting from last 3rd underscore to extension dot. e.g. I need a
output like I000001_FILE001_1 from the above given string.
Thanks in advance...
- Hiren Modi

Well, you could use lastIndexOf three times (with the start position option) but I think it looks more like a job for a regular expression (which could also check if the file name has the pattern you're expecting.)
You might want a pattern like "[A-Z][0-9]_{6}[A-Z0-9]*_[0-9]\.txt$", depends how much these file names are expected to vary.

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SQL> select * from EMailNotify;
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How to Substring from the last 3rd underscore?

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