Modify regex and add tests

[luo-git]

Resolve #229

[codecov-io]

Codecov Report

Merging #268 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #268   +/-   ##
=========================================
  Coverage     64.44%   64.44%           
  Complexity      550      550           
=========================================
  Files           100      100           
  Lines          1817     1817           
  Branches        189      189           
=========================================
  Hits           1171     1171           
  Misses          572      572           
  Partials         74       74           

Impacted Files	Coverage Δ	Complexity Δ
...main/java/seedu/address/model/tag/FileAddress.java	61.53% <ø> (ø)	8.00 <0.00> (ø)

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[Ma-Yueran]

LGTM