[Solved] Apply pattern and rule correctly

Questions
1

Hi all,
I’m just beginning to learn about patterns and rules.
How would I have to write the following rule, so that the enclosing list does not get processed by it?
(Meaning: How do I get rid of the first “x”?)

{1, 2, 3, a, b, c} /. {i_Integer -> i*2, s_Symbol -> x}
x[2, 4, 6, x, x, x]

Thank you very much!

2

{1, 2, 3, a, b, c} /. {i_Integer → i*2,
s_Symbol /; Head[s] != List → x}

3

Hmm, that doesn’t work, I’m afraid.

4

Try

Replace[{1, 2, 3, a, b, c}, {i_Integer -> i*2, s_ -> x}, {1}]

which gives me

{2,4,6,x,x,x}
5

That did the trick. Thank you!