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-rw-r--r--miasm/ir/ir.py2
-rw-r--r--miasm/ir/translators/z3_ir.py5
2 files changed, 4 insertions, 3 deletions
diff --git a/miasm/ir/ir.py b/miasm/ir/ir.py
index e9b86899..d26c5d1d 100644
--- a/miasm/ir/ir.py
+++ b/miasm/ir/ir.py
@@ -48,7 +48,7 @@ def _expr_loc_to_symb(expr, loc_db):
     return m2_expr.ExprId(name, expr.size)
 
 
-ESCAPE_CHARS = re.compile('[' + re.escape('{}') + '&|<>' + ']')
+ESCAPE_CHARS = re.compile(r'[\{\}&|<>]')
 
 class TranslatorHtml(Translator):
     __LANG__ = "custom_expr_color"
diff --git a/miasm/ir/translators/z3_ir.py b/miasm/ir/translators/z3_ir.py
index 4b674c4e..c72ff36f 100644
--- a/miasm/ir/translators/z3_ir.py
+++ b/miasm/ir/translators/z3_ir.py
@@ -1,10 +1,11 @@
 from builtins import map
 from builtins import range
-import imp
+import importlib.util
 import logging
 
 # Raise an ImportError if z3 is not available WITHOUT actually importing it
-imp.find_module("z3")
+if importlib.util.find_spec("z3") is None:
+    raise ImportError("No module named 'z3'")
 
 from miasm.ir.translators.translator import Translator