diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5c10731437..ce1bbb9338 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -26,6 +26,7 @@
 
 #### :bug: Bug fix
 
+- Fix JS regex literal parsing in character classes. https://github.com/rescript-lang/rescript/pull/7790
 - Fix creating interface for functions with upper bounded polymorphic args. https://github.com/rescript-lang/rescript/pull/7786
 
 #### :memo: Documentation
diff --git a/compiler/syntax/src/res_scanner.ml b/compiler/syntax/src/res_scanner.ml
index ee731f0ec5..7aa249d645 100644
--- a/compiler/syntax/src/res_scanner.ml
+++ b/compiler/syntax/src/res_scanner.ml
@@ -584,9 +584,9 @@ let scan_regex scanner =
       bring_buf_up_to_date ~start_offset:last_char_offset;
       Buffer.contents buf)
   in
-  let rec scan () =
+  let rec scan ?(in_char_class = false) () =
     match scanner.ch with
-    | '/' ->
+    | '/' when not in_char_class ->
       let last_char_offset = scanner.offset in
       next scanner;
       let pattern = result ~first_char_offset ~last_char_offset in
@@ -610,10 +610,16 @@ let scan_regex scanner =
     | '\\' ->
       next scanner;
       next scanner;
-      scan ()
+      scan ~in_char_class ()
+    | '[' when not in_char_class ->
+      next scanner;
+      scan ~in_char_class:true ()
+    | ']' when in_char_class ->
+      next scanner;
+      scan ~in_char_class:false ()
     | _ ->
       next scanner;
-      scan ()
+      scan ~in_char_class ()
   in
   let pattern, flags = scan () in
   let end_pos = position scanner in
diff --git a/tests/syntax_tests/data/parsing/errors/expressions/expected/regexCharacterClasses.res.txt b/tests/syntax_tests/data/parsing/errors/expressions/expected/regexCharacterClasses.res.txt
new file mode 100644
index 0000000000..ccd4e67318
--- /dev/null
+++ b/tests/syntax_tests/data/parsing/errors/expressions/expected/regexCharacterClasses.res.txt
@@ -0,0 +1,20 @@
+
+  Syntax error!
+  syntax_tests/data/parsing/errors/expressions/regexCharacterClasses.res:1:14
+
+  1 │ let re = /[]/]/
+  2 │ 
+
+  I'm not sure what to parse here when looking at "]".
+
+
+  Syntax error!
+  syntax_tests/data/parsing/errors/expressions/regexCharacterClasses.res:1:16
+
+  1 │ let re = /[]/]/
+  2 │ 
+
+  unterminated regex
+
+let re = [%re {js|/[]/|js}]
+;;[%re {js|//|js}]
\ No newline at end of file
diff --git a/tests/syntax_tests/data/parsing/errors/expressions/regexCharacterClasses.res b/tests/syntax_tests/data/parsing/errors/expressions/regexCharacterClasses.res
new file mode 100644
index 0000000000..356d64c646
--- /dev/null
+++ b/tests/syntax_tests/data/parsing/errors/expressions/regexCharacterClasses.res
@@ -0,0 +1 @@
+let re = /[]/]/
diff --git a/tests/syntax_tests/data/parsing/grammar/expressions/expected/regex.res.txt b/tests/syntax_tests/data/parsing/grammar/expressions/expected/regex.res.txt
index ccfa5e018b..0549328722 100644
--- a/tests/syntax_tests/data/parsing/grammar/expressions/expected/regex.res.txt
+++ b/tests/syntax_tests/data/parsing/grammar/expressions/expected/regex.res.txt
@@ -76,10 +76,7 @@ let re = [%re {js|/a[b-d]/|js}]
 let re = [%re {js|/a[-b]/|js}]
 let re = [%re {js|/a[\\-b]/|js}]
 let re = [%re {js|/a[]b/|js}]
-let re = [%re {js|/a[/|js}]
 let re = [%re {js|/a\\/|js}]
-let re = [%re {js|/abc)/|js}]
-let re = [%re {js|/(abc/|js}]
 let re = [%re {js|/a]/|js}]
 let re = [%re {js|/a[]]b/|js}]
 let re = [%re {js|/a[\\]]b/|js}]
@@ -239,7 +236,6 @@ let re = [%re {js|/a[-b]/|js}]
 let re = [%re {js|/a[b-]/|js}]
 let re = [%re {js|/a[b-a]/|js}]
 let re = [%re {js|/a[]b/|js}]
-let re = [%re {js|/a[/|js}]
 let re = [%re {js|/a]/|js}]
 let re = [%re {js|/a[]]b/|js}]
 let re = [%re {js|/a[^bc]d/|js}]
@@ -258,8 +254,6 @@ let re = [%re {js|/a\\(b/|js}]
 let re = [%re {js|/a\\(*b/|js}]
 let re = [%re {js|/a\\(*b/|js}]
 let re = [%re {js|/a\\\\b/|js}]
-let re = [%re {js|/abc)/|js}]
-let re = [%re {js|/(abc/|js}]
 let re = [%re {js|/((a))/|js}]
 let re = [%re {js|/(a)b(c)/|js}]
 let re = [%re {js|/a+b+c/|js}]
@@ -317,134 +311,6 @@ let re = [%re {js|/[k]/|js}]
 let re = [%re {js|/a[-]?c/|js}]
 let re = [%re {js|/(abc)\\1/|js}]
 let re = [%re {js|/([a-c]*)\\1/|js}]
-let re = [%re {js|/(?i)abc/|js}]
-let re = [%re {js|/(?i)abc/|js}]
-let re = [%re {js|/(?i)abc/|js}]
-let re = [%re {js|/(?i)abc/|js}]
-let re = [%re {js|/(?i)abc/|js}]
-let re = [%re {js|/(?i)abc/|js}]
-let re = [%re {js|/(?i)ab*c/|js}]
-let re = [%re {js|/(?i)ab*bc/|js}]
-let re = [%re {js|/(?i)ab*bc/|js}]
-let re = [%re {js|/(?i)ab*?bc/|js}]
-let re = [%re {js|/(?i)ab{0,}?bc/|js}]
-let re = [%re {js|/(?i)ab+?bc/|js}]
-let re = [%re {js|/(?i)ab+bc/|js}]
-let re = [%re {js|/(?i)ab+bc/|js}]
-let re = [%re {js|/(?i)ab{1,}bc/|js}]
-let re = [%re {js|/(?i)ab+bc/|js}]
-let re = [%re {js|/(?i)ab{1,}?bc/|js}]
-let re = [%re {js|/(?i)ab{1,3}?bc/|js}]
-let re = [%re {js|/(?i)ab{3,4}?bc/|js}]
-let re = [%re {js|/(?i)ab{4,5}?bc/|js}]
-let re = [%re {js|/(?i)ab??bc/|js}]
-let re = [%re {js|/(?i)ab??bc/|js}]
-let re = [%re {js|/(?i)ab{0,1}?bc/|js}]
-let re = [%re {js|/(?i)ab??bc/|js}]
-let re = [%re {js|/(?i)ab??c/|js}]
-let re = [%re {js|/(?i)ab{0,1}?c/|js}]
-let re = [%re {js|/(?i)^abc$/|js}]
-let re = [%re {js|/(?i)^abc$/|js}]
-let re = [%re {js|/(?i)^abc/|js}]
-let re = [%re {js|/(?i)^abc$/|js}]
-let re = [%re {js|/(?i)abc$/|js}]
-let re = [%re {js|/(?i)^/|js}]
-let re = [%re {js|/(?i)$/|js}]
-let re = [%re {js|/(?i)a.c/|js}]
-let re = [%re {js|/(?i)a.c/|js}]
-let re = [%re {js|/(?i)a.*?c/|js}]
-let re = [%re {js|/(?i)a.*c/|js}]
-let re = [%re {js|/(?i)a[bc]d/|js}]
-let re = [%re {js|/(?i)a[bc]d/|js}]
-let re = [%re {js|/(?i)a[b-d]e/|js}]
-let re = [%re {js|/(?i)a[b-d]e/|js}]
-let re = [%re {js|/(?i)a[b-d]/|js}]
-let re = [%re {js|/(?i)a[-b]/|js}]
-let re = [%re {js|/(?i)a[b-]/|js}]
-let re = [%re {js|/(?i)a[b-a]/|js}]
-let re = [%re {js|/(?i)a[]b/|js}]
-let re = [%re {js|/(?i)a[/|js}]
-let re = [%re {js|/(?i)a]/|js}]
-let re = [%re {js|/(?i)a[]]b/|js}]
-let re = [%re {js|/(?i)a[^bc]d/|js}]
-let re = [%re {js|/(?i)a[^bc]d/|js}]
-let re = [%re {js|/(?i)a[^-b]c/|js}]
-let re = [%re {js|/(?i)a[^-b]c/|js}]
-let re = [%re {js|/(?i)a[^]b]c/|js}]
-let re = [%re {js|/(?i)a[^]b]c/|js}]
-let re = [%re {js|/(?i)ab|cd/|js}]
-let re = [%re {js|/(?i)ab|cd/|js}]
-let re = [%re {js|/(?i)()ef/|js}]
-let re = [%re {js|/(?i)*a/|js}]
-let re = [%re {js|/(?i)(*)b/|js}]
-let re = [%re {js|/(?i)$b/|js}]
-let re = [%re {js|/(?i)a\\/|js}]
-let re = [%re {js|/(?i)a\\(b/|js}]
-let re = [%re {js|/(?i)a\\(*b/|js}]
-let re = [%re {js|/(?i)a\\(*b/|js}]
-let re = [%re {js|/(?i)a\\\\b/|js}]
-let re = [%re {js|/(?i)abc)/|js}]
-let re = [%re {js|/(?i)(abc/|js}]
-let re = [%re {js|/(?i)((a))/|js}]
-let re = [%re {js|/(?i)(a)b(c)/|js}]
-let re = [%re {js|/(?i)a+b+c/|js}]
-let re = [%re {js|/(?i)a{1,}b{1,}c/|js}]
-let re = [%re {js|/(?i)a**/|js}]
-let re = [%re {js|/(?i)a.+?c/|js}]
-let re = [%re {js|/(?i)a.*?c/|js}]
-let re = [%re {js|/(?i)a.{0,5}?c/|js}]
-let re = [%re {js|/(?i)(a+|b)*/|js}]
-let re = [%re {js|/(?i)(a+|b){0,}/|js}]
-let re = [%re {js|/(?i)(a+|b)+/|js}]
-let re = [%re {js|/(?i)(a+|b){1,}/|js}]
-let re = [%re {js|/(?i)(a+|b)?/|js}]
-let re = [%re {js|/(?i)(a+|b){0,1}/|js}]
-let re = [%re {js|/(?i)(a+|b){0,1}?/|js}]
-let re = [%re {js|/(?i))(/|js}]
-let re = [%re {js|/(?i)[^ab]*/|js}]
-let re = [%re {js|/(?i)abc/|js}]
-let re = [%re {js|/(?i)a*/|js}]
-let re = [%re {js|/(?i)([abc])*d/|js}]
-let re = [%re {js|/(?i)([abc])*bcd/|js}]
-let re = [%re {js|/(?i)a|b|c|d|e/|js}]
-let re = [%re {js|/(?i)(a|b|c|d|e)f/|js}]
-let re = [%re {js|/(?i)abcd*efg/|js}]
-let re = [%re {js|/(?i)ab*/|js}]
-let re = [%re {js|/(?i)ab*/|js}]
-let re = [%re {js|/(?i)(ab|cd)e/|js}]
-let re = [%re {js|/(?i)[abhgefdc]ij/|js}]
-let re = [%re {js|/(?i)^(ab|cd)e/|js}]
-let re = [%re {js|/(?i)(abc|)ef/|js}]
-let re = [%re {js|/(?i)(a|b)c*d/|js}]
-let re = [%re {js|/(?i)(ab|ab*)bc/|js}]
-let re = [%re {js|/(?i)a([bc]*)c*/|js}]
-let re = [%re {js|/(?i)a([bc]*)(c*d)/|js}]
-let re = [%re {js|/(?i)a([bc]+)(c*d)/|js}]
-let re = [%re {js|/(?i)a([bc]*)(c+d)/|js}]
-let re = [%re {js|/(?i)a[bcd]*dcdcde/|js}]
-let re = [%re {js|/(?i)a[bcd]+dcdcde/|js}]
-let re = [%re {js|/(?i)(ab|a)b*c/|js}]
-let re = [%re {js|/(?i)((a)(b)c)(d)/|js}]
-let re = [%re {js|/(?i)[a-zA-Z_][a-zA-Z0-9_]*/|js}]
-let re = [%re {js|/(?i)^a(bc+|b[eh])g|.h$/|js}]
-let re = [%re {js|/(?i)(bc+d$|ef*g.|h?i(j|k))/|js}]
-let re = [%re {js|/(?i)(bc+d$|ef*g.|h?i(j|k))/|js}]
-let re = [%re {js|/(?i)(bc+d$|ef*g.|h?i(j|k))/|js}]
-let re = [%re {js|/(?i)(bc+d$|ef*g.|h?i(j|k))/|js}]
-let re = [%re {js|/(?i)(bc+d$|ef*g.|h?i(j|k))/|js}]
-let re = [%re {js|/(?i)((((((((((a))))))))))/|js}]
-let re = [%re {js|/(?i)((((((((((a))))))))))\\10/|js}]
-let re = [%re {js|/(?i)(((((((((a)))))))))/|js}]
-let re = [%re {js|/(?i)(?:(?:(?:(?:(?:(?:(?:(?:(?:(a))))))))))/|js}]
-let re = [%re {js|/(?i)(?:(?:(?:(?:(?:(?:(?:(?:(?:(a|b|c))))))))))/|js}]
-let re = [%re {js|/(?i)multiple words of text/|js}]
-let re = [%re {js|/(?i)multiple words/|js}]
-let re = [%re {js|/(?i)(.*)c(.*)/|js}]
-let re = [%re {js|/(?i)\\((.*), (.*)\\)/|js}]
-let re = [%re {js|/(?i)[k]/|js}]
-let re = [%re {js|/(?i)a[-]?c/|js}]
-let re = [%re {js|/(?i)(abc)\\1/|js}]
-let re = [%re {js|/(?i)([a-c]*)\\1/|js}]
 let re = [%re {js|/a(?!b)./|js}]
 let re = [%re {js|/a(?=d)./|js}]
 let re = [%re {js|/a(?=c|d)./|js}]
@@ -499,4 +365,10 @@ let re = [%re {js|/^a*?$/|js}]
 let re = [%re {js|/^((a)c)?(ab)$/|js}]
 let re = [%re {js|/^([ab]*?)(?=(b)?)c/|js}]
 let re = [%re {js|/^([ab]*?)(?!(b))c/|js}]
-let re = [%re {js|/^([ab]*?)(?<!(a))c/|js}]
\ No newline at end of file
+let re = [%re {js|/^([ab]*?)(?<!(a))c/|js}]
+let re = [%re {js|/\.[^/.]+$/|js}]
+let re = [%re {js|/[^]]/|js}]
+let re = [%re {js|/[/]/|js}]
+let re = [%re {js|/[]]/|js}]
+let re = [%re {js|/[\]]/|js}]
+let re = [%re {js|/[[]]/|js}]
\ No newline at end of file
diff --git a/tests/syntax_tests/data/parsing/grammar/expressions/regex.res b/tests/syntax_tests/data/parsing/grammar/expressions/regex.res
index ad12a26ef9..f54844552b 100644
--- a/tests/syntax_tests/data/parsing/grammar/expressions/regex.res
+++ b/tests/syntax_tests/data/parsing/grammar/expressions/regex.res
@@ -100,10 +100,7 @@ let re = /a[\\-b]/
 // NOTE: not an error under PCRE/PRE:
 //let re = /a[b-]/
 let re = /a[]b/
-let re = /a[/
 let re = /a\\/
-let re = /abc)/
-let re = /(abc/
 let re = /a]/
 let re = /a[]]b/
 let re = /a[\\]]b/
@@ -273,7 +270,6 @@ let re = /a[-b]/
 let re = /a[b-]/
 let re = /a[b-a]/
 let re = /a[]b/
-let re = /a[/
 let re = /a]/
 let re = /a[]]b/
 let re = /a[^bc]d/
@@ -293,8 +289,6 @@ let re = /a\\(b/
 let re = /a\\(*b/
 let re = /a\\(*b/
 let re = /a\\\\b/
-let re = /abc)/
-let re = /(abc/
 let re = /((a))/
 let re = /(a)b(c)/
 let re = /a+b+c/
@@ -355,138 +349,6 @@ let re = /[k]/
 let re = /a[-]?c/
 let re = /(abc)\\1/
 let re = /([a-c]*)\\1/
-let re = /(?i)abc/
-let re = /(?i)abc/
-let re = /(?i)abc/
-let re = /(?i)abc/
-let re = /(?i)abc/
-let re = /(?i)abc/
-let re = /(?i)ab*c/
-let re = /(?i)ab*bc/
-let re = /(?i)ab*bc/
-let re = /(?i)ab*?bc/
-let re = /(?i)ab{0,}?bc/
-let re = /(?i)ab+?bc/
-let re = /(?i)ab+bc/
-let re = /(?i)ab+bc/
-let re = /(?i)ab{1,}bc/
-let re = /(?i)ab+bc/
-let re = /(?i)ab{1,}?bc/
-let re = /(?i)ab{1,3}?bc/
-let re = /(?i)ab{3,4}?bc/
-let re = /(?i)ab{4,5}?bc/
-let re = /(?i)ab??bc/
-let re = /(?i)ab??bc/
-let re = /(?i)ab{0,1}?bc/
-let re = /(?i)ab??bc/
-let re = /(?i)ab??c/
-let re = /(?i)ab{0,1}?c/
-let re = /(?i)^abc$/
-let re = /(?i)^abc$/
-let re = /(?i)^abc/
-let re = /(?i)^abc$/
-let re = /(?i)abc$/
-let re = /(?i)^/
-let re = /(?i)$/
-let re = /(?i)a.c/
-let re = /(?i)a.c/
-let re = /(?i)a.*?c/
-let re = /(?i)a.*c/
-let re = /(?i)a[bc]d/
-let re = /(?i)a[bc]d/
-let re = /(?i)a[b-d]e/
-let re = /(?i)a[b-d]e/
-let re = /(?i)a[b-d]/
-let re = /(?i)a[-b]/
-let re = /(?i)a[b-]/
-let re = /(?i)a[b-a]/
-let re = /(?i)a[]b/
-let re = /(?i)a[/
-let re = /(?i)a]/
-let re = /(?i)a[]]b/
-let re = /(?i)a[^bc]d/
-let re = /(?i)a[^bc]d/
-let re = /(?i)a[^-b]c/
-let re = /(?i)a[^-b]c/
-let re = /(?i)a[^]b]c/
-let re = /(?i)a[^]b]c/
-let re = /(?i)ab|cd/
-let re = /(?i)ab|cd/
-let re = /(?i)()ef/
-let re = /(?i)*a/
-let re = /(?i)(*)b/
-let re = /(?i)$b/
-let re = /(?i)a\\/
-let re = /(?i)a\\(b/
-let re = /(?i)a\\(*b/
-let re = /(?i)a\\(*b/
-let re = /(?i)a\\\\b/
-let re = /(?i)abc)/
-let re = /(?i)(abc/
-let re = /(?i)((a))/
-let re = /(?i)(a)b(c)/
-let re = /(?i)a+b+c/
-let re = /(?i)a{1,}b{1,}c/
-let re = /(?i)a**/
-let re = /(?i)a.+?c/
-let re = /(?i)a.*?c/
-let re = /(?i)a.{0,5}?c/
-let re = /(?i)(a+|b)*/
-let re = /(?i)(a+|b){0,}/
-let re = /(?i)(a+|b)+/
-let re = /(?i)(a+|b){1,}/
-let re = /(?i)(a+|b)?/
-let re = /(?i)(a+|b){0,1}/
-let re = /(?i)(a+|b){0,1}?/
-let re = /(?i))(/
-let re = /(?i)[^ab]*/
-let re = /(?i)abc/
-let re = /(?i)a*/
-let re = /(?i)([abc])*d/
-let re = /(?i)([abc])*bcd/
-let re = /(?i)a|b|c|d|e/
-let re = /(?i)(a|b|c|d|e)f/
-let re = /(?i)abcd*efg/
-let re = /(?i)ab*/
-let re = /(?i)ab*/
-let re = /(?i)(ab|cd)e/
-let re = /(?i)[abhgefdc]ij/
-let re = /(?i)^(ab|cd)e/
-let re = /(?i)(abc|)ef/
-let re = /(?i)(a|b)c*d/
-let re = /(?i)(ab|ab*)bc/
-let re = /(?i)a([bc]*)c*/
-let re = /(?i)a([bc]*)(c*d)/
-let re = /(?i)a([bc]+)(c*d)/
-let re = /(?i)a([bc]*)(c+d)/
-let re = /(?i)a[bcd]*dcdcde/
-let re = /(?i)a[bcd]+dcdcde/
-let re = /(?i)(ab|a)b*c/
-let re = /(?i)((a)(b)c)(d)/
-let re = /(?i)[a-zA-Z_][a-zA-Z0-9_]*/
-let re = /(?i)^a(bc+|b[eh])g|.h$/
-let re = /(?i)(bc+d$|ef*g.|h?i(j|k))/
-let re = /(?i)(bc+d$|ef*g.|h?i(j|k))/
-let re = /(?i)(bc+d$|ef*g.|h?i(j|k))/
-let re = /(?i)(bc+d$|ef*g.|h?i(j|k))/
-let re = /(?i)(bc+d$|ef*g.|h?i(j|k))/
-let re = /(?i)((((((((((a))))))))))/
-let re = /(?i)((((((((((a))))))))))\\10/
-//let re = /(?i)((((((((((a))))))))))\\41/
-//let re = /(?i)((((((((((a))))))))))\\41/
-let re = /(?i)(((((((((a)))))))))/
-let re = /(?i)(?:(?:(?:(?:(?:(?:(?:(?:(?:(a))))))))))/
-let re = /(?i)(?:(?:(?:(?:(?:(?:(?:(?:(?:(a|b|c))))))))))/
-let re = /(?i)multiple words of text/
-let re = /(?i)multiple words/
-let re = /(?i)(.*)c(.*)/
-let re = /(?i)\\((.*), (.*)\\)/
-let re = /(?i)[k]/
-//let re = /(?i)abcd/
-//let re = /(?i)a(bc)d/
-let re = /(?i)a[-]?c/
-let re = /(?i)(abc)\\1/
-let re = /(?i)([a-c]*)\\1/
 let re = /a(?!b)./
 let re = /a(?=d)./
 let re = /a(?=c|d)./
@@ -607,3 +469,14 @@ let re = /^((a)c)?(ab)$/
 let re = /^([ab]*?)(?=(b)?)c/
 let re = /^([ab]*?)(?!(b))c/
 let re = /^([ab]*?)(?<!(a))c/
+
+let re = /\.[^/.]+$/
+
+// Leading ']' is literal; '/' inside class must not terminate
+let re = /[^]]/
+let re = /[/]/
+
+// Additional leading ']' edge cases
+let re = /[]]/
+let re = /[\]]/
+let re = /[[]]/