<?xml version="1.0" encoding="utf-8"?><ajax><![CDATA[{"aid":45,"path":"attachment/Mon_1112/2_1_5728040df3ab346.jpg"}]]></ajax>
grep -o -E 'aid":[1-9]*' tmp.txt
aid":45
grep -o -E 'aid":[1-9]*' tmp.txt |awk -F: '{print $2}'
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