Function isPotentiallyEmpty

Returns whether at least one path of the given element does neither consume characters nor assert characters.

Backreferences

A backreferences will only be considered potentially empty, iff at least one of the following conditions is true:

• The backreference is trivially always empty. (see isEmptyBackreference)
• The referenced capturing group is a descendant of the given element and at least one of the following conditions is true:
  • The referenced capturing group is potentially zero-length.
  • The backreferences is not always after its referenced capturing group. (see isStrictBackreference)

Relations

• isPotentiallyEmpty(e) -> isPotentiallyZeroLength(e)

See

• isZeroLength
• isPotentiallyZeroLength
• isEmpty
• getLengthRange