[R] How to scan df from a specific word?

[M.Ribeiro]

Sorry, the explanation wasn't very good...just to explain better.

I am writing a loop to read and process every time a different file in the
same script.
And what I want to load into a variable each time is a data.frame that is
bellow the word source in all of my files.

So I would like to recognize the word Source in the text file....and read
the table bellow source until the next blank line (the file has more written
stuff bellow the data frame that I want to read too)

Here is an example of the file. I want the df to read from source until the
blank line right above the words "Analysis of Variance

Notice:     37 singularities detected in design matrix.
   1 LogL=-2664.01     S2=  1.0000       8367 df    :   2 components
constrained
   2 LogL=-2269.45     S2=  1.0000       8367 df
   3 LogL=-1698.47     S2=  1.0000       8367 df
   4 LogL=-1252.72     S2=  1.0000       8367 df
   5 LogL=-1013.52     S2=  1.0000       8367 df
   6 LogL=-957.409     S2=  1.0000       8367 df
   7 LogL=-944.252     S2=  1.0000       8367 df
   8 LogL=-939.976     S2=  1.0000       8367 df
   9 LogL=-938.908     S2=  1.0000       8367 df
  10 LogL=-938.798     S2=  1.0000       8367 df
  11 LogL=-938.795     S2=  1.0000       8367 df
  12 LogL=-938.795     S2=  1.0000       8367 df

 Source                Model  terms     Gamma     Component    Comp/SE   % C
 Residual               8383   8367
 at(type,1).Nfam          62     62   10.1131       10.1131       1.81   0 P  
 at(type,2).Nfam          62     62   28.1153       28.1153       2.16   0 P  
 rep.iblk                768    768   63.2919       63.2919      10.94   0 P  
 at(type,1).Nfemale       44     44   29.9049       29.9049       2.93   0 P  
 at(type,1).Nclone      2689   2689   109.560       109.560      12.66   0 P  
 at(type,2).Nfemale       44     44   14.0305       14.0305       1.68   0 P  
 Variance                  0      0   479.040       479.040      36.23   0 P  
 Variance                  0      0   490.580       490.580      17.51   0 P  
 Variance                  0      0   469.932       469.932      36.51   0 P  
 Variance                  0      0   544.654       544.654      17.86   0 P  

 Analysis of Variance              NumDF              F_inc  
  27 mu                                1            5860.84                

  12 culture                           1               0.07                
  10 type                              1              29.59                
  28 culture.rep                       6              14.06                
  30 culture.rep.type                  7               2.17                
  36 at(type,1).Nfam                      62 effects fitted 
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