I want to extract attribute1 and attribute3 values only. I don't understand why charset doesn't seem to work in my case to "skip" any other attributes (attribute3 is not extracted as I would like):

content: {<tag attribute1="valueattribute1" attribute2="valueattribute2" attribute3="valueattribute3">
</tag>
<tag attribute2="valueattribute21" attribute1="valueattribute11" >
</tag>
}


attribute1: [{attribute1="} copy valueattribute1 to {"} thru {"}]
attribute3: [{attribute3="} copy valueattribute3 to {"} thru {"}]

spacer: charset reduce [tab newline #" "]
letter: complement spacer 
to-space: [some letter | end]

attributes-rule: [(valueattribute1: none valueattribute3: none) [attribute1 | none] to-space [attribute3 | none] (print valueattribute1 print valueattribute3)
| [attribute3 | none] to-space [attribute1 | none] (print valueattribute3 print valueattribute1
valueattribute1: none valueattribute3: none
)
| none
]

rule: [any [to {<tag } thru {<tag } attributes-rule {>} to {</tag>} thru {</tag>}] to end]

parse content rule

output is

>> parse content rule
valueattribute1
none
== true
>>