parsing - Can the antlr4 parser see matching opening and closing text pattern? -

i'm matching user-defined html-template tags (simplified):

{% label %} ... {% endlabel %} 

the "label" alphanumeric value user can define himself, e.g.:

{% mytag %}<div>...</div>{% endmytag %} 

is there way tell parser label start tag text has match endlabel end tag text? in other words, want invalid:

{% mytag %}<div>...</div>{% endnotmatchingtag %} 

my lexer looks this:

label :                 alpha (alpha|digit|underscore)* ; fragment underscore:    '_' ; fragment alpha:         [a-za-z] ; fragment digit:         [0-9] ;  end :                   'end' endlabel :              end label tagstart :              '{%' tagend :                '%}'  ws :                    [ \t\r\n]+ -> skip ; 

and parser rule looks similar this:

customtag: tagstart label tagend block tagstart endlabel tagend;     

(and block matches text or other tags recursively)

right i'm checking match in listener, hoping in parser. there way ensure endlabel equal 'end' + label @ parser level in antlr4?

... , possible if weren't prepending 'end' in lexer?

create 2 additional lexer rules

endtag : tagstart endlabel tagend; starttag : tagstart label tagend; 

make sure token endlabel not subsumed label (yet label matches same text, preferred because first in grammar!)

use new tokens in grammar, similar did:

taggedelement : starttag othernodes endtag; 

and insert semantic predicate

taggedelement : starttag othernodes endtag {matches($starttag.text,$endtag.text)}; 

where matches true if tags matching.