Regex quantifiers {,n} vs. {0,n}?

[vefatica]

The help says

Take Command / TCC Regular Expression Syntax

{,n} at least 0 but not more than n times ({0,n})

Shouldn't all of these give 1?

v:\> echo %@regex["ab{0,1}c",abc]
1

v:\> echo %@regex["ab{0,1}c",ac]
1

v:\> echo %@regex["ab{,1}c",abc]
0

v:\> echo %@regex["ab{,1}c",ac]
0

 

[vefatica]

Never mind. They all give 1 if I use Ruby regex syntax.

 

[Alpengreis]

JFI: also always 1 with Python regex syntax ...