diff --git a/py_asciimath/const.py b/py_asciimath/const.py
index dd39032..28edca9 100644
--- a/py_asciimath/const.py
+++ b/py_asciimath/const.py
@@ -459,6 +459,7 @@ def get_symbols_for(
     {"asciimath": "'", "latex": "'", "mathml": "'"},
     {"asciimath": "/", "latex": "/", "mathml": "/"},
     {"asciimath": "|", "latex": "|", "mathml": "|"},
+    {"asciimath": "|", "latex": "\\vert", "mathml": "|"},
     {"asciimath": "|", "latex": "\\mid", "mathml": "|"},
     {"asciimath": ":", "latex": ":", "mathml": ":"},
     {"asciimath": "int", "latex": "\\int", "mathml": "∫"},
diff --git a/py_asciimath/grammar/latex_grammar.py b/py_asciimath/grammar/latex_grammar.py
index 4ca273f..c46dee2 100644
--- a/py_asciimath/grammar/latex_grammar.py
+++ b/py_asciimath/grammar/latex_grammar.py
@@ -20,12 +20,11 @@
         | s "_" s -> exp_under
         | s "^" s -> exp_super
         | s "_" s "^" s -> exp_under_super
-    s: _l start? _r -> exp_par
-        | "\\left" (_l | /\./ | /\\vert/ | /\\mid/) start? "\\right" (_r | /\./ | /\\vert/ | /\\mid/) -> exp_par
+    s: "\\left" (_l | /\./ | /\\vert/ | /\\mid/ | /\[/) start? "\\right" (_r | /\./ | /\\vert/ | /\\mid/ | /\]/) -> exp_par
         | "\\begin{{matrix}}" row_mat (/\\\\/ row_mat?)* "\\end{{matrix}}" -> exp_mat
+        | /\\sqrt/ "[" i "]" "{{" start "}}" -> exp_binary
         | _u "{{" start "}}" -> exp_unary
         | _b "{{" start "}}" "{{" start "}}" -> exp_binary
-        | /\\sqrt/ "[" start "]" "{{" start "}}" -> exp_binary
         | _latex1 -> symbol
         | _latex2 -> symbol
         | _c -> const
diff --git a/py_asciimath/transformer/transformer.py b/py_asciimath/transformer/transformer.py
index 9975f9e..d4a32e0 100644
--- a/py_asciimath/transformer/transformer.py
+++ b/py_asciimath/transformer/transformer.py
@@ -405,13 +405,13 @@ def exp_par(self, items):
             left = "{:"
         elif left in ["\\vert", "\\mid"]:
             left = "|:"
-        else:
+        elif left != "[":
             left = l2mml_left[items[0].value]
         if right == ".":
             right = ":}"
         elif right in ["\\vert", "\\mid"]:
             right = ":|"
-        else:
+        elif right != "]":
             right = l2mml_right[items[-1].value]
         return left + " ".join(items[1:-1]) + right
 
@@ -421,7 +421,7 @@ def exp_unary(self, items):
 
     @log
     def exp_binary(self, items):
-        if items[0] == "\\sqrt":
+        if items[0].startswith("\\sqrt"):
             return "root(" + items[1] + ")(" + items[2] + ")"
         return l2mml_bin[items[0]] + "(" + items[1] + ")(" + items[2] + ")"
 
diff --git a/py_asciimath/translation/latex2asciimath.py b/py_asciimath/translation/latex2asciimath.py
index a350195..b85c80a 100644
--- a/py_asciimath/translation/latex2asciimath.py
+++ b/py_asciimath/translation/latex2asciimath.py
@@ -6,9 +6,11 @@
 left_parenthesis = get_symbols_for("left_parenthesis", "asciimath", "latex")
 left_parenthesis.pop(".")
 left_parenthesis.pop("\\vert")
+# left_parenthesis.pop("[")
 right_parenthesis = get_symbols_for("right_parenthesis", "asciimath", "latex")
 right_parenthesis.pop(".")
 right_parenthesis.pop("\\vert")
+# right_parenthesis.pop("]")
 
 smb = get_symbols_for("misc_symbols", "asciimath", "latex")
 smb.update(get_symbols_for("function_symbols", "asciimath", "latex"))
@@ -18,4 +20,6 @@
 smb.update(get_symbols_for("operation_symbols", "asciimath", "latex"))
 smb.update(get_symbols_for("greek_letters", "asciimath", "latex"))
 smb.update(get_symbols_for("arrows", "asciimath", "latex"))
+smb.update(left_parenthesis)
+smb.update(right_parenthesis)
 smb = dict(sorted(smb.items(), key=lambda x: (-len(x[0]), x[0])))