Escapable masks

[danon]

Feature description

Add ability to create formatted patterns, but with ability to escape them.

With the snippet below, there's no possibility from the user perspective (the supplier of the mask/format string) to make e literal.

Pattern::format('welcome:e', [
  'e' => '\w+'
]);

We could created new method formatEscapable, which means any value in the format can be escaped.

Pattern::formatEscapable('welcome:e', '\\', [
  'e'  => '\w+',
  'e\e' => 'x', // disallowed
  'e\\' => 'x',  // disallowed
  '\\' => 'siema' // disallowed
]);

Question arises, what happens when someone passes quoted character that's not in the patterns, or leaves it as the last character in the mas

Pattern::formatEscapable('\e \x \', '\\', ['e'  => '\w+',]);

Wha should be the result? Replace \e but not \x and \? What if someone escaps the escape? Should the escape be the same? Disallowed? Or customizable?

• With \e, we should treat it as e literal
• With \x we should treat it as x literal
• with \\ .. ?
• with \ at the end of the format?

[danon]

Descoped