Regex - check if input still has chances to become matching

Question

We\'ve got such regexp:

var regexp = /^one (two)+ three/;

So only string like \"one two three\" or \"one two three four\

Answer 1

Still not 100% sure what you are asking for, but you can also nest them, like this:

var regexp = /^(one)+((\s+two)+((\s+three)+((\s+four)+)?)?)?$/;

Matches:

• one
• one two two
• one two two three
• one two two three three four

Does not match:

• one three