symfony/symfony — pull request #9274 by stof (2013-10-10 22:27:14+00:00)
Title: [Yaml] Fixed the escaping of strings starting with a dash when dumping

Dashes need to be escaped in character sets in regexes as they are used to specify a range otherwise.
It fixes the dumper bug reported in #9039 (the parsing issue is not fix here)

| Q | A
| ------------- | ---
| Bug fix? | yes
| New feature? | no
| BC breaks? | no
| Deprecations? | no
| Tests pass? | yes
| Fixed tickets | partially #9039
| License | MIT
| Doc PR | n/a