[R] Regex for ^ (the caret symbol)?

[S Ellison]

> -----Original Message-----
> > So what is the special behavior of the ^ symbol when not at 
>> the beginning of the string that occurs when it is not escaped?
> 
> I think it retains its meaning as an assertion that it occurs 
> at the beginning of the line, and so a pattern like "a^b" 
> could never match anything.  

... unless a or b are newlines and you are matching multi-line expressions, when ^ and $ match before and after line breaks as well as beginning and end of string.

S Ellison

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