Hi Jon,
this may be much easier than using regex. You can use built in prognosis functions to filter out data older than x days. E.g in this case, you would like to have:
ELAPSEDT < 15 Days
Try it out and see if it filters data accordingly. E.g if you just apply to a display that showed above data, you should only get top 2 rows. Let us know if this works?
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Thanks,
Shoaib