[Form][Validator] Fixed generation of HTML5 pattern attribute based on Assert\Regex to remove delimiters.

[Validator] Added delimiter escaping to Validator\Constraints\Regex::getNonDelimitedPattern

[Form][Validator] Added htmlPattern option for Regex Validation.

[Validator] Fixed Validator\Constraints\Regex::getNonDelimitedPattern variable declarations

[Validator] Fixed tests for Regex htmlPattern option (instead of html_pattern)

[Validation] tweaked generation of pattern to include .* when not anchors are present. Also removed the exception and made getNonDelimitedPattern private
merged branch lavoiesl/master (PR #4522)

Commits
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6f9eda9 [Form][Validator] Fixed generation of HTML5 pattern attribute based on Assert\Regex to remove delimiters.

Discussion
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[Form][Validator] Fixed generation of HTML5 pattern attribute based on Assert\Regex by removing delimiters or using a new option: htmlPattern.

Hopefully, this time is the good one…

* Fixes: [#3766, #4077, #4513, #4520, #4521]
* Bug fix: yes
* Feature addition: yes
* BC break: no
* Symfony2 tests pass: yes

In Issue #3766, it was asked that Assert\Regex generates HTML5 pattern attribute.
It was done in PR #4077, but the generated Regex is in delimited format which is not supported by HTML5.

Hence, `/[a-z]+/` would be converted to `[a-z]+`.
If flags are specified like in `/[a-z]+/i`, it cannot be converted and pattern validation will be disabled client-side. If is however now possible, using a new option, `htmlPattern`, to specify the pattern you want to be used.

Example:

```php
<?php
/**
 * @Assert\Regex(pattern="/^[0-9]+[a-z]*$/i", htmlPattern="^[0-9]+[a-zA-Z]*$")
 */
private $civic_number;
```

**Note**: [Documentation](http://symfony.com/doc/current/reference/constraints/Regex.html) should be updated accordingly.

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by lavoiesl at 2012-06-08T15:45:17Z

God, I just found out you can "add more commits to this pull request by pushing to the master branch on lavoiesl/symfony"…

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by travisbot at 2012-06-08T15:50:31Z

This pull request [passes](http://travis-ci.org/symfony/symfony/builds/1568634) (merged 2d767b41 into b84b46ba).

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by petajaros at 2012-07-04T14:23:16Z

Anything new about this issue?

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by lavoiesl at 2012-07-04T16:25:43Z

Alright, tests are passing using `phpunit -c phpunit.xml.dist --filter 'RegexValidatorTest'`. @travisbot reports errors because he can’t even start the tests due to dependencies, which is not related

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by vicb at 2012-07-04T16:31:13Z

It should be ready to merge when you have taken the last comments into account. thanks.

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by lavoiesl at 2012-07-04T16:39:05Z

So it seems this PR will finally pass, thanks a lot.

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by vicb at 2012-07-04T17:03:35Z

Thank you for this PR and the changes.

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by fabpot at 2012-07-04T17:10:20Z

@lavoiesl Can you squash your commits before I merge? Thanks.

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by lavoiesl at 2012-07-04T17:25:18Z

There. I also left trace of some commits I did.

Thanks