[match:group]
M1: "(2 + x)"
M2: "(3)"

[fail:group]
F1: "22"
F2: "y"


[match:factor]
M1: "-2"
M2: "+22"
M3: "-2.71828"
M4: "-x"
M5: "(2 + x)"
M6: "-(a * b)"

[fail:factor]
F1: "x4"
F2: "- 2"

[match:term]
M1: "2 * 4"
M2: "3x"
M3: "5 / 2"
M4*: "5 / 2x"
M5: "5 / -2x"
M6: "-3*2y"
M7: "4x"
M8: "-2x"
M9: "20 / 2 * 2"
M10: "20 / (2 * 2)"

[fail:term]
F1: "2 + 4"
F2: "4 - 5"

[match:expression]
M1: "3 + x"
M2: "-5 - -4x"
M3: "(a + b)(a - b)"
M4: "a - 5 + b"
M5: "-5 - +4x"
M6: "5 - 4 + 3"
M7: "5 - (4 + 3)"

[fail:expression]
F1: "-5 - - 4x"