"substring('abcd' from 2)",
		"substring('abcd' , 2 , 2)",

		"substring('abcd' , 22 )",
		"trim('  aab  ')",
		"trim(leading from '  aab  ')",
		"trim(trailing from '  aab  ')",
		"trim(both from '  aab  ')",

		"trim(both '12' from '  aab  ')",
		"trim(leading '12' from '  aab  ')",
		"trim(trailing '12' from '  aab  ')",
		"count(23)",
	}
	for i, tc := range validCases {
		err := p.ParseString(tc, &fex)

	{"TrimRight", "", "", ""},
	{"TrimRight", "☺\xc0", "☺", "☺\xc0"},
	{"TrimPrefix", "aabb", "a", "abb"},
	{"TrimPrefix", "aabb", "b", "aabb"},
	{"TrimSuffix", "aabb", "a", "aabb"},
	{"TrimSuffix", "aabb", "b", "aab"},
}

type TrimNilTest struct {
	f   string
	in  []byte
	arg string
	out []byte
}

var trimNilTests = []TrimNilTest{
	{"Trim", nil, "", nil},
	{"Trim", []byte{}, "", nil},

      </match>
    </magic>
    <glob pattern="*.las"/>
    <glob pattern="*.laz"/>
  </mime-type>
  <mime-type type="application/x-authorware-bin">
    <glob pattern="*.aab"/>
    <glob pattern="*.x32"/>
    <glob pattern="*.u32"/>
    <glob pattern="*.vox"/>
  </mime-type>
  <mime-type type="application/x-authorware-map">
    <glob pattern="*.aam"/>
  </mime-type>