randym/axlsx — pull request #88 by jurriaan (2012-04-28 09:36:58+00:00)
Title: fix Table#header_cells method

Changed to a non-greedy \w so table's are generated properly

Without fix:

```ruby
"A1:Q19".gsub(/^(\w+)(\d+)\:(\w+)\d+$/, '\1\2:\3\2')
=> "A1:Q11"
```

With fix:

```ruby
"A1:Q19".gsub(/^(\w+?)(\d+)\:(\w+?)\d+$/, '\1\2:\3\2')
=> "A1:Q1"
```