Subj : Re: smthing with regular expressions
To   : eix ät lap ttu ee
From : Brendan Eich
Date : Fri May 07 2004 12:26 pm

Heiko Vainsalu wrote:
> Hi
> 
> Hope someone can give me a reason for this.
> Need to control a value. And as the condition is quite easy regular 
> expressions could be used.
> 
> The value must be one of the following: 0, 1, 2, ..., 9, 10
> 
> When using Regular expressions I would write it intuitively
>     ^(10)|[0-9]$
> 
> but when testing then 11 matches this expression just like 1.1 or any 
> numeric constructions. Where is the trick?

The alternation operation | has looser precedence than anchors such as ^ 
and $.  Also, you do not need or want parentheses around 10:

     ^10$|^[0-9]$

/be

.