App controller for sortmerna mapper

+ doc strings edited.
You're right, the " | \( " doesn't belong in the regular expression. I'm just trying to pull the number following that statement, which comes in the form:
...
 Results:
    Total reads = 7499521
    Total reads for de novo clustering = 1266425
    Total reads passing E-value threshold = 7431503 (99.09%)
    Total reads failing E-value threshold = 68018 (0.91%)
    Minimum read length = 75
    Maximum read length = 152
    Mean read length = 121
 By database:
    /home/evko1434/genomes/97_otus_gg_13_8.fasta		99.09%
 Total reads passing %id and %coverage thresholds = 6165078
 Total OTUs = 28665

So, (re.split('Total reads for de novo clustering = ',  line)[1]).strip() is the correct approach.