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Function std.uri.uriLength
Does string s[] start with a URL?
Prototype
ptrdiff_t uriLength(Char)( Char[] s ) if (isSomeChar!Char);
Returns
-1 it does not
len it does, and s[0..len] is the slice of s[] that is that URL
Example
string s1 = "http://www.digitalmars.com/~fred/fredsRX.html#foo end!";
assert (uriLength(s1) == 49);
string s2 = "no uri here";
assert (uriLength(s2) == -1);
assert (uriLength("issue 14924") < 0);