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Perl is a text matching topic, request bosses to give directions

Time：04-13

According to the two key words to extract data: keyword AT known and value, requested the following test document data, the number in the
Test. TXT:
The value...
.
.
The AT
.
The value
0.3 V
.
.
The value
I just extract the value of 0.3 v, currently only know middle value above the AT a key word, how to according to the two key words to extract the 0.3 v data?

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Scripting language (Perl/Python)

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