regexp which matches nothing?

[Joao Silva]

How i can construct regexp, which will always matches nothing?

For example:

"xxxxxxx".match /my_special_regexp/
=> should be ALWAYS nil

 

[7stud --]

How i can construct regexp, which will always matches nothing?

For example:

"xxxxxxx".match /my_special_regexp/
=> should be ALWAYS nil

How about:

re = /$a^/

 

[Kilian Verhetsel]

Why do you want to have a such regex ?

Anyway, it seems that /^$a/ will never match with any string.

"a".match /^$a/
=> nil
"".match /^$a/
=> nil
"a ".match /^$a/
=> nil

 

[7stud --]

How about:

re = /$a^/

I guess that could be made even simpler:

re = /a^/

 

[Ralf Mueller]

How i can construct regexp, which will always matches nothing?

For example:

"xxxxxxx".match /my_special_regexp/
=> should be ALWAYS nil

not sure, but something that should always be nil .... what about the constant 'nil'

 

[7stud --]

I guess that could be made even simpler:

re = /a^/

..and probably more efficient:

re = /a\A/

 

[Ralf Mueller]

How i can construct regexp, which will always matches nothing?

For example:

"xxxxxxx".match /my_special_regexp/
=> should be ALWAYS nil

Just out of curiosity: Why do you use a method call, when you expect a constant?