perl reciter.pl
checking 'invalid.txt'
        found:'z2=0.7'
checking 'valid.txt'
        found:'x2=0.7'
        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)