diff --git a/src/grammar.json b/src/grammar.json
index 3374dac..68286a0 100644
--- a/src/grammar.json
+++ b/src/grammar.json
@@ -2128,7 +2128,7 @@
                 "type": "IMMEDIATE_TOKEN",
                 "content": {
                   "type": "PATTERN",
-                  "value": "[a-zA-Z]+"
+                  "value": "[a-zA-Z0-9]+"
                 }
               },
               "named": true,
diff --git a/src/parser.c b/src/parser.c
index 7dde71a..43d9c02 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -11312,7 +11312,8 @@ static bool ts_lex(TSLexer *lexer, TSStateId state) {
       if (lookahead == '~') ADVANCE(187);
       if (lookahead == '\t' ||
           lookahead == ' ') SKIP(108)
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('b' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 108:
@@ -11382,7 +11383,8 @@ static bool ts_lex(TSLexer *lexer, TSStateId state) {
       if (lookahead == '~') ADVANCE(187);
       if (lookahead == '\t' ||
           lookahead == ' ') SKIP(111)
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('b' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 111:
@@ -11451,7 +11453,8 @@ static bool ts_lex(TSLexer *lexer, TSStateId state) {
       if (lookahead == '~') ADVANCE(187);
       if (lookahead == '\t' ||
           lookahead == ' ') SKIP(114)
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('b' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 114:
@@ -11555,7 +11558,8 @@ static bool ts_lex(TSLexer *lexer, TSStateId state) {
       if (lookahead == '~') ADVANCE(187);
       if (lookahead == '\t' ||
           lookahead == ' ') SKIP(119)
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('b' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 119:
@@ -11622,7 +11626,8 @@ static bool ts_lex(TSLexer *lexer, TSStateId state) {
       if (lookahead == '~') ADVANCE(187);
       if (lookahead == '\t' ||
           lookahead == ' ') SKIP(122)
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('b' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 122:
@@ -11688,7 +11693,8 @@ static bool ts_lex(TSLexer *lexer, TSStateId state) {
       if (lookahead == '~') ADVANCE(187);
       if (lookahead == '\t' ||
           lookahead == ' ') SKIP(125)
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('b' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 125:
@@ -11849,7 +11855,8 @@ static bool ts_lex(TSLexer *lexer, TSStateId state) {
       if (lookahead == '~') ADVANCE(187);
       if (lookahead == '\t' ||
           lookahead == ' ') SKIP(133)
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('b' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 133:
@@ -11912,7 +11919,8 @@ static bool ts_lex(TSLexer *lexer, TSStateId state) {
       if (lookahead == '~') ADVANCE(187);
       if (lookahead == '\t' ||
           lookahead == ' ') SKIP(136)
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('b' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 136:
@@ -11976,7 +11984,8 @@ static bool ts_lex(TSLexer *lexer, TSStateId state) {
       if (lookahead == '~') ADVANCE(187);
       if (lookahead == '\t' ||
           lookahead == ' ') SKIP(139)
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('b' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 139:
@@ -12038,7 +12047,8 @@ static bool ts_lex(TSLexer *lexer, TSStateId state) {
       if (lookahead == '~') ADVANCE(187);
       if (lookahead == '\t' ||
           lookahead == ' ') SKIP(142)
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('b' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 142:
@@ -12921,7 +12931,8 @@ static bool ts_lex(TSLexer *lexer, TSStateId state) {
       if (lookahead == '~') ADVANCE(187);
       if (lookahead == '\t' ||
           lookahead == ' ') SKIP(265)
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('b' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 265:
@@ -12991,7 +13002,8 @@ static bool ts_lex(TSLexer *lexer, TSStateId state) {
       if (lookahead == '~') ADVANCE(187);
       if (lookahead == '\t' ||
           lookahead == ' ') SKIP(267)
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('b' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 267:
@@ -14369,164 +14381,191 @@ static bool ts_lex(TSLexer *lexer, TSStateId state) {
     case 473:
       ACCEPT_TOKEN(aux_sym_sigil_token3);
       if (lookahead == 'a') ADVANCE(496);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('b' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 474:
       ACCEPT_TOKEN(aux_sym_sigil_token3);
       if (lookahead == 'c') ADVANCE(498);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 475:
       ACCEPT_TOKEN(aux_sym_sigil_token3);
       if (lookahead == 'c') ADVANCE(484);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 476:
       ACCEPT_TOKEN(aux_sym_sigil_token3);
       if (lookahead == 'd') ADVANCE(565);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 477:
       ACCEPT_TOKEN(aux_sym_sigil_token3);
       if (lookahead == 'd') ADVANCE(650);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 478:
       ACCEPT_TOKEN(aux_sym_sigil_token3);
       if (lookahead == 'e') ADVANCE(646);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 479:
       ACCEPT_TOKEN(aux_sym_sigil_token3);
       if (lookahead == 'e') ADVANCE(656);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 480:
       ACCEPT_TOKEN(aux_sym_sigil_token3);
       if (lookahead == 'e') ADVANCE(489);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 481:
       ACCEPT_TOKEN(aux_sym_sigil_token3);
       if (lookahead == 'e') ADVANCE(493);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 482:
       ACCEPT_TOKEN(aux_sym_sigil_token3);
       if (lookahead == 'e') ADVANCE(494);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 483:
       ACCEPT_TOKEN(aux_sym_sigil_token3);
       if (lookahead == 'f') ADVANCE(497);
       if (lookahead == 'n') ADVANCE(476);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 484:
       ACCEPT_TOKEN(aux_sym_sigil_token3);
       if (lookahead == 'h') ADVANCE(638);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 485:
       ACCEPT_TOKEN(aux_sym_sigil_token3);
       if (lookahead == 'h') ADVANCE(480);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 486:
       ACCEPT_TOKEN(aux_sym_sigil_token3);
       if (lookahead == 'l') ADVANCE(495);
       if (lookahead == 'n') ADVANCE(477);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 487:
       ACCEPT_TOKEN(aux_sym_sigil_token3);
       if (lookahead == 'n') ADVANCE(476);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 488:
       ACCEPT_TOKEN(aux_sym_sigil_token3);
       if (lookahead == 'n') ADVANCE(601);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 489:
       ACCEPT_TOKEN(aux_sym_sigil_token3);
       if (lookahead == 'n') ADVANCE(542);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 490:
       ACCEPT_TOKEN(aux_sym_sigil_token3);
       if (lookahead == 'n') ADVANCE(477);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 491:
       ACCEPT_TOKEN(aux_sym_sigil_token3);
       if (lookahead == 'o') ADVANCE(642);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 492:
       ACCEPT_TOKEN(aux_sym_sigil_token3);
       if (lookahead == 'r') ADVANCE(557);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 493:
       ACCEPT_TOKEN(aux_sym_sigil_token3);
       if (lookahead == 'r') ADVANCE(634);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 494:
       ACCEPT_TOKEN(aux_sym_sigil_token3);
       if (lookahead == 's') ADVANCE(474);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 495:
       ACCEPT_TOKEN(aux_sym_sigil_token3);
       if (lookahead == 's') ADVANCE(478);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 496:
       ACCEPT_TOKEN(aux_sym_sigil_token3);
       if (lookahead == 't') ADVANCE(475);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 497:
       ACCEPT_TOKEN(aux_sym_sigil_token3);
       if (lookahead == 't') ADVANCE(481);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 498:
       ACCEPT_TOKEN(aux_sym_sigil_token3);
       if (lookahead == 'u') ADVANCE(479);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 499:
       ACCEPT_TOKEN(aux_sym_sigil_token3);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 500:
@@ -14707,7 +14746,8 @@ static bool ts_lex(TSLexer *lexer, TSStateId state) {
       END_STATE();
     case 542:
       ACCEPT_TOKEN(anon_sym_when);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 543:
@@ -14779,7 +14819,8 @@ static bool ts_lex(TSLexer *lexer, TSStateId state) {
       END_STATE();
     case 557:
       ACCEPT_TOKEN(anon_sym_or);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 558:
@@ -14817,7 +14858,8 @@ static bool ts_lex(TSLexer *lexer, TSStateId state) {
       END_STATE();
     case 565:
       ACCEPT_TOKEN(anon_sym_and);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 566:
@@ -14959,7 +15001,8 @@ static bool ts_lex(TSLexer *lexer, TSStateId state) {
       END_STATE();
     case 601:
       ACCEPT_TOKEN(anon_sym_in);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 602:
@@ -15094,7 +15137,8 @@ static bool ts_lex(TSLexer *lexer, TSStateId state) {
       END_STATE();
     case 634:
       ACCEPT_TOKEN(anon_sym_after);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 635:
@@ -15116,7 +15160,8 @@ static bool ts_lex(TSLexer *lexer, TSStateId state) {
       END_STATE();
     case 638:
       ACCEPT_TOKEN(anon_sym_catch);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 639:
@@ -15138,7 +15183,8 @@ static bool ts_lex(TSLexer *lexer, TSStateId state) {
       END_STATE();
     case 642:
       ACCEPT_TOKEN(anon_sym_do);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 643:
@@ -15160,7 +15206,8 @@ static bool ts_lex(TSLexer *lexer, TSStateId state) {
       END_STATE();
     case 646:
       ACCEPT_TOKEN(anon_sym_else);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 647:
@@ -15182,7 +15229,8 @@ static bool ts_lex(TSLexer *lexer, TSStateId state) {
       END_STATE();
     case 650:
       ACCEPT_TOKEN(anon_sym_end);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 651:
@@ -15218,7 +15266,8 @@ static bool ts_lex(TSLexer *lexer, TSStateId state) {
       END_STATE();
     case 656:
       ACCEPT_TOKEN(anon_sym_rescue);
-      if (('A' <= lookahead && lookahead <= 'Z') ||
+      if (('0' <= lookahead && lookahead <= '9') ||
+          ('A' <= lookahead && lookahead <= 'Z') ||
           ('a' <= lookahead && lookahead <= 'z')) ADVANCE(499);
       END_STATE();
     case 657: