Regex stickiness

[arseniiv]

[Previously opened in a wrong repo, sorry.]

Some time ago, Javascript got a stickiness flag y. Now Ceylon can have cross-platform sticky regexes, as in Java it is implemented (as \G boundary condition at the start of the pattern) since at least Java 7 (possibly earlier).

Relevant docs about sticky mode:

• Java SE 7 java.util.regex.Pattern § Boundary matchers.
• MDN RegExp.prototype.sticky.

About compatibility issues: one can easily test if y is supported, via creating RegExp('', 'y') and catching an (or no) exception.

Maybe other useful additions have appeared in JS, too.