Optimize Inflector

[xepozz]

We have introduced https://github.com/yiisoft/strings/blob/master/src/CombinedRegexp.php that helps with a loop of regexps.
There are some places to apply CombinedRegexp:

• strings/src/Inflector.php

  Line 439 in 63aef52

  public function toSingular(string $input): string

• strings/src/Inflector.php

  Line 418 in 63aef52

  public function toPlural(string $input): string

[vjik]

User can override rules via withSingularizeRules() and withPluralizeRules() methods, and use regular expressions with different flags. It is do not allow us use CombinedRegexp here.

[xepozz]

I didn't get you

[vjik]

I didn't get you

CombinedRegexp uses same flags for all expressions, but inflector allow use expressions with different flags.