diff --git a/VCEntities/VCEntities/identifier/AliasComputer.swift b/VCEntities/VCEntities/identifier/AliasComputer.swift
index 4d14986..343453b 100644
--- a/VCEntities/VCEntities/identifier/AliasComputer.swift
+++ b/VCEntities/VCEntities/identifier/AliasComputer.swift
@@ -8,6 +8,7 @@ import VCCrypto
 public struct AliasComputer {
     
     let hashingAlg = Sha256()
+    let pattern = "[^A-Za-z0-9]+"
     
     public init() {}