find_match utility function to unify a few lines of code

[cpuhrsch]

find_match searches a list of strings and returns first entry that partially or fully contains the given string match.

[codecov[bot]]

Codecov Report

Merging #1165 (82ddc35) into master (97dddf0) will decrease coverage by 0.02%. The diff coverage is 92.30%.

@@            Coverage Diff             @@
##           master    #1165      +/-   ##
==========================================
- Coverage   79.61%   79.59%   -0.03%     
==========================================
  Files          47       47              
  Lines        3204     3205       +1     
==========================================
  Hits         2551     2551              
- Misses        653      654       +1     

Impacted Files	Coverage Δ
torchtext/experimental/datasets/raw/common.py	86.90% <80.00%> (-0.44%)	:arrow_down:
...ext/experimental/datasets/raw/language_modeling.py	92.68% <100.00%> (-0.50%)	:arrow_down:
...t/experimental/datasets/raw/text_classification.py	87.67% <100.00%> (-0.17%)	:arrow_down:

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