---input---
$\alpha_i\in\{\alpha:\alpha\leq3\}\ \text{something}$

$$\alpha_i\in\{\alpha:\alpha\leq3\}\ \text{something}$$

\[\alpha_i\in\{\alpha:\alpha\leq3\}\ \text{something}\]

\(\alpha_i\in\{\alpha:\alpha\leq3\}\ \text{something}\)

---tokens---
'$'           Literal.String
'\\alpha'     Name.Variable
'_'           Name.Builtin
'i'           Name.Builtin
'\\in'        Name.Variable
'\\{'         Name.Variable
'\\alpha'     Name.Variable
':'           Name.Builtin
'\\alpha'     Name.Variable
'\\leq'       Name.Variable
'3'           Literal.Number
'\\}'         Name.Variable
'\\'          Name.Variable
' '           Name.Builtin
'\\text'      Name.Variable
'{'           Name.Builtin
'something'   Name.Builtin
'}'           Name.Builtin
'$'           Literal.String
'\n\n'        Text

'$$'          Literal.String.Backtick
'\\alpha'     Name.Variable
'_'           Name.Builtin
'i'           Name.Builtin
'\\in'        Name.Variable
'\\{'         Name.Variable
'\\alpha'     Name.Variable
':'           Name.Builtin
'\\alpha'     Name.Variable
'\\leq'       Name.Variable
'3'           Literal.Number
'\\}'         Name.Variable
'\\'          Name.Variable
' '           Name.Builtin
'\\text'      Name.Variable
'{'           Name.Builtin
'something'   Name.Builtin
'}'           Name.Builtin
'$$'          Literal.String
'\n\n'        Text

'\\['         Literal.String.Backtick
'\\alpha'     Name.Variable
'_'           Name.Builtin
'i'           Name.Builtin
'\\in'        Name.Variable
'\\{'         Name.Variable
'\\alpha'     Name.Variable
':'           Name.Builtin
'\\alpha'     Name.Variable
'\\leq'       Name.Variable
'3'           Literal.Number
'\\}'         Name.Variable
'\\'          Name.Variable
' '           Name.Builtin
'\\text'      Name.Variable
'{'           Name.Builtin
'something'   Name.Builtin
'}'           Name.Builtin
'\\]'         Literal.String
'\n\n'        Text

'\\('         Literal.String
'\\alpha'     Name.Variable
'_'           Name.Builtin
'i'           Name.Builtin
'\\in'        Name.Variable
'\\{'         Name.Variable
'\\alpha'     Name.Variable
':'           Name.Builtin
'\\alpha'     Name.Variable
'\\leq'       Name.Variable
'3'           Literal.Number
'\\}'         Name.Variable
'\\'          Name.Variable
' '           Name.Builtin
'\\text'      Name.Variable
'{'           Name.Builtin
'something'   Name.Builtin
'}'           Name.Builtin
'\\)'         Literal.String
'\n'          Text