How to write correctly expression?

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1

I want to write name matcher for checking header field exist and its value has length greater than 1, i do same as:

@existandlenght_greater1 {
  {header.fieldx} != '' && len( {header.fieldx} ) > 1
}

How to write it correctly?
Thanks much.

2

It could look like this:

@foo expression {header.Field} != '' && size({header.Field}) > 1

or like this:

@foo `{header.Field} != '' && size({header.Field}) > 1`
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