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help with preg_match pattern

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Yup managed to confuse myself reading the manual.

I have an numerically indexed array that consists of fragments of 
a prescription.
Rarely I may have an array element in the form of:

[Alert: This Rx was initially created on 1/27/2014.]

I want to delete those array elements (probably using 
array_slice), but first I need to figure out which array elements 
match the pattern.  The date may change and will use one or two 
digit days and months.
I could just look for the first part of the element, but I want 
to be prepared for the people upstream (over whom I have no 
influence - different company) to add other Alerts, some of which 
I will want to ignore, some of which I may want to keep.

I am certainly open to other suggestions.

bill

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help with preg_match pattern bill <william@TechServSys.com> - 2014-01-28 13:53 -0500
  Re: help with preg_match pattern Jerry Stuckle <jstucklex@attglobal.net> - 2014-01-28 14:04 -0500
  Re: help with preg_match pattern Denis McMahon <denismfmcmahon@gmail.com> - 2014-01-28 19:42 +0000

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