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OA    P total    M total    F total    M 0    M1-4    M 5-9    M 10-14
+    M 15-19    M 20-24    M 25-29    M 30-34    M 35-39    M 40-44   
+ M 45-49    M 50-54    M 55-59    M 60-64    M 65-69    M 70-74    M 
+75-79    M 80-84    M 85+    F 0    F 1-4    F 5-9    F 10-14    F15-
+19    F 20-24    F 25-29    F 30-34    F 35-39    F 40-44    F 45-49 
+   F 50-54    F 55-59    F 60-64    F 65-69    F 70-74    F 75-79    
+F 80-84    F 85+

    if (my @match_A = $line =~  /^([^\t]+)\t #1
                     ([^\t]+)\t #2
...
                     ([^\t]+)\t #42   # (.{1,}\t) #42 
                     /x) {

Use of uninitialized value in pattern match (m//) at reformat_text_fil
+e.pl line
125, <FILE> line 4.