1 files changed, 4 insertions, 6 deletions

diff --git a/arch/x86/tools/gen-insn-attr-x86.awk b/arch/x86/tools/gen-insn-attr-x86.awk
index 7a6850683c3..eaf11f52fc0 100644
--- a/arch/x86/tools/gen-insn-attr-x86.awk
+++ b/arch/x86/tools/gen-insn-attr-x86.awk
@@ -6,8 +6,6 @@
 
 # Awk implementation sanity check
 function check_awk_implement() {
-        if (!match("abc", "[[:lower:]]+"))
-                return "Your awk doesn't support charactor-class."
         if (sprintf("%x", 0) != "0")
                 return "Your awk has a printf-format problem."
         return ""
@@ -44,12 +42,12 @@ BEGIN {
         delete gtable
         delete atable
 
-        opnd_expr = "^[[:alpha:]/]"
+        opnd_expr = "^[A-Za-z/]"
         ext_expr = "^\\("
         sep_expr = "^\\|$"
-        group_expr = "^Grp[[:alnum:]]+"
+        group_expr = "^Grp[0-9A-Za-z]+"
 
-        imm_expr = "^[IJAO][[:lower:]]"
+        imm_expr = "^[IJAO][a-z]"
         imm_flag["Ib"] = "INAT_MAKE_IMM(INAT_IMM_BYTE)"
         imm_flag["Jb"] = "INAT_MAKE_IMM(INAT_IMM_BYTE)"
         imm_flag["Iw"] = "INAT_MAKE_IMM(INAT_IMM_WORD)"
@@ -62,7 +60,7 @@ BEGIN {
         imm_flag["Ob"] = "INAT_MOFFSET"
         imm_flag["Ov"] = "INAT_MOFFSET"
 
-        modrm_expr = "^([CDEGMNPQRSUVW/][[:lower:]]+|NTA|T[012])"
+        modrm_expr = "^([CDEGMNPQRSUVW/][a-z]+|NTA|T[012])"
         force64_expr = "\\([df]64\\)"
         rex_expr = "^REX(\\.[XRWB]+)*"
         fpu_expr = "^ESC" # TODO