Merge pull request #651 from JuliaSymbolics/occursin

Fix occursin for needle as a number case

src/substitute.jl

@@ -51,11 +51,14 @@ Base.occursin(needle, haystack::Symbolic) = _occursin(needle, haystack)
 Base.occursin(needle::Symbolic, haystack) = _occursin(needle, haystack)
 function _occursin(needle, haystack)
     isequal(needle, haystack) && return true
-
     if iscall(haystack)
         args = arguments(haystack)
         for arg in args
-            occursin(needle, arg) && return true
+            if needle isa Integer || needle isa AbstractFloat
+                isequal(needle, arg) && return true
+            else
+               occursin(needle, arg) && return true
+            end
         end
     end
     return false

test/basics.jl

@@ -184,6 +184,8 @@ end
     @test occursin(a, a + b)
     @test !occursin(sin(a), a + b + c)
     @test occursin(sin(a),  a * b + c + sin(a^2 * sin(a)))
+    @test occursin(0.01, 0.01*a)
+    @test !occursin(0.01, a * b * c)
 end
 
 @testset "printing" begin