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ls -l
-rw-rw-rw-   1 user     group          26 Jun 10 13:27 invalid.txt
...
x2=0.7
z2=0.7
some_t2=0.7

#!/usr/bin/perl

...
  }

}

perl reciter.pl
checking 'invalid.txt'
...
        found:'z2=0.7'
        found:'some_t2=0.7'
FILE valid.txt has a valid content ( x2=0.7, z2=0.7, some_t2=0.7)