---input---
// regex

blah(/abc/);
x = /abc/;
x = /abc/.match;

// math

blah(1/2); //comment
x = 1 / 2 / 3;
x = 1/1/.1;

// broken

x=/1/;
x=1/a/g;
x=a/a/g;

// real-world

var x = 1/(1+Math.sqrt(sum)); // convert to number between 1-0
return Math.round((num / den) * 100)/100;

---tokens---
''            Text
'// regex\n'  Comment.Single

'\n'          Text

'blah'        Name.Other
'('           Punctuation
'/abc/'       Literal.String.Regex
')'           Punctuation
';'           Punctuation
'\n'          Text

'x'           Name.Other
' '           Text
'='           Operator
' '           Text
'/abc/'       Literal.String.Regex
';'           Punctuation
'\n'          Text

'x'           Name.Other
' '           Text
'='           Operator
' '           Text
'/abc/'       Literal.String.Regex
'.'           Punctuation
'match'       Name.Other
';'           Punctuation
'\n\n'        Text

'// math\n'   Comment.Single

'\n'          Text

'blah'        Name.Other
'('           Punctuation
'1'           Literal.Number.Float
'/'           Operator
'2'           Literal.Number.Float
')'           Punctuation
';'           Punctuation
' '           Text
'//comment\n' Comment.Single

'x'           Name.Other
' '           Text
'='           Operator
' '           Text
'1'           Literal.Number.Float
' '           Text
'/'           Operator
' '           Text
'2'           Literal.Number.Float
' '           Text
'/'           Operator
' '           Text
'3'           Literal.Number.Float
';'           Punctuation
'\n'          Text

'x'           Name.Other
' '           Text
'='           Operator
' '           Text
'1'           Literal.Number.Float
'/'           Operator
'1'           Literal.Number.Float
'/'           Operator
'.1'          Literal.Number.Float
';'           Punctuation
'\n\n'        Text

'// broken\n' Comment.Single

'\n'          Text

'x'           Name.Other
'='           Operator
'/1/'         Literal.String.Regex
';'           Punctuation
'\n'          Text

'x'           Name.Other
'='           Operator
'1'           Literal.Number.Float
'/'           Operator
'a'           Name.Other
'/'           Operator
'g'           Name.Other
';'           Punctuation
'\n'          Text

'x'           Name.Other
'='           Operator
'a'           Name.Other
'/'           Operator
'a'           Name.Other
'/'           Operator
'g'           Name.Other
';'           Punctuation
'\n\n'        Text

'// real-world\n' Comment.Single

'\n'          Text

'var'         Keyword.Declaration
' '           Text
'x'           Name.Other
' '           Text
'='           Operator
' '           Text
'1'           Literal.Number.Float
'/'           Operator
'('           Punctuation
'1'           Literal.Number.Float
'+'           Operator
'Math'        Name.Builtin
'.'           Punctuation
'sqrt'        Name.Other
'('           Punctuation
'sum'         Name.Other
')'           Punctuation
')'           Punctuation
';'           Punctuation
' '           Text
'// convert to number between 1-0\n' Comment.Single

'return'      Keyword
' '           Text
'Math'        Name.Builtin
'.'           Punctuation
'round'       Name.Other
'('           Punctuation
'('           Punctuation
'num'         Name.Other
' '           Text
'/'           Operator
' '           Text
'den'         Name.Other
')'           Punctuation
' '           Text
'*'           Operator
' '           Text
'100'         Literal.Number.Float
')'           Punctuation
'/'           Operator
'100'         Literal.Number.Float
';'           Punctuation
'\n'          Text