perl -Mstrict -Mwarnings context.pl is and the have
$matched = [
  'Regular expressions [have] always been a weak spot for me, [and]
I\'ve got a question',
  'me stumped.  Here\'s [the]
problem I\'m trying to solve.  I [have] somewhat large articles',
  'what I\'d like to do [is]
capture [the] word [and] X number of words before [and] after it
while tagging [the] matching word in [the] captured text.  My
',
  'like this.  [The] problem I
[have] [is] that if there [is] more than one term [and] they overlap,
[the] nth term will not be',
  'So my next thought [is]
lookahead/lookbehind',
  'don\'t capture.  [Is] there a way
to do this',
  'a single regex?  [Is] a regex even [the] best way
to do this'
];