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Breaks a test:

<pre>
ruby test\unit\helpers\application_helper_test.rb
DL is deprecated, please use Fiddle
Run options: --seed 7252

# Running:

.............................................................E..................
....................

Finished in 2.519144s, 39.6960 runs/s, 154.0206 assertions/s.

1) Error:
ApplicationHelperTest#test_parse_redmine_links_should_handle_a_tag_without_attri
butes:
NoMethodError: undefined method `+' for nil:NilClass
app/helpers/application_helper.rb:943:in `block in parse_redmine_links'
app/helpers/application_helper.rb:800:in `gsub!'
app/helpers/application_helper.rb:800:in `parse_redmine_links'
test/unit/helpers/application_helper_test.rb:1279:in `test_parse_redmine_lin
ks_should_handle_a_tag_without_attributes'

100 runs, 388 assertions, 0 failures, 1 errors, 0 skips
</pre>
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Sorry, wrong place for "tag_content" capture group.
Fixed.
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Committed, thanks for fixing the patch.
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Dmitry, that's a nice refactoring making the method a lot more readable and thus easier to understand.
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