Merge pull request #26283 from JuliaLang/aa/isfound

Deprecate contains to occursin, deprecate callable regexes

Author: JeffBezanson

test/distributed_exec.jl

@@ -1301,7 +1301,7 @@ let thrown = false
         thrown = true
         local b = IOBuffer()
         showerror(b, e)
-        @test contains(String(take!(b)), "sqrt will only return")
+        @test occursin("sqrt will only return", String(take!(b)))
     end
     @test thrown
 end
@@ -1375,7 +1375,7 @@ try
     error("unexpected")
 catch ex
     @test isa(ex.captured.ex.exceptions[1].ex, ErrorException)
-    @test contains(ex.captured.ex.exceptions[1].ex.msg, "BoundsError")
+    @test occursin("BoundsError", ex.captured.ex.exceptions[1].ex.msg)
     @test ex.captured.ex.exceptions[2].ex == UndefVarError(:DontExistOn1)
 end