diff --git a/justfile b/justfile
index c603d31..993ca94 100644
--- a/justfile
+++ b/justfile
@@ -88,6 +88,7 @@ functionsWithArgs := '''
   path_exists
   quote
   replace
+  semver_matches
   sha256
   sha256_file
   shoutykebabcase
diff --git a/syntax/just.vim b/syntax/just.vim
index 8c37979..c2ed7ad 100644
--- a/syntax/just.vim
+++ b/syntax/just.vim
@@ -184,14 +184,14 @@ syn cluster justOtherCurlyBraces contains=justCurlyBraces,justBadCurlyBraces
 
 syn region justBuiltInFunction
       \ transparent end=')'
-      \ matchgroup=justFunction start="\v%(a%(bsolute_pat|rc)h|c%(apitalize|lean)|e%(nv%(_var%(_or_default)?)?|xtension)|file_%(name|stem)|j%(oin|ust%(_executable|file%(_directory)?))|kebabcase|lowerca%(melca)?se|pa%(rent_directory|th_exists)|quote|replace|s%(h%(a256%(_file)?|outy%(kebab|snake)case)|nakecase)|t%(itlecase|rim%(_%(end|start)%(_match%(es)?)?)?)|u%(pperca%(melca)?se|uid)|without_extension|invocation_directory%(_native)?|num_cpus|os%(_family)?)%(%(\s|\\\n)*\()@="
+      \ matchgroup=justFunction start="\v%(a%(bsolute_pat|rc)h|c%(apitalize|lean)|e%(nv%(_var%(_or_default)?)?|xtension)|file_%(name|stem)|j%(oin|ust%(_executable|file%(_directory)?))|kebabcase|lowerca%(melca)?se|pa%(rent_directory|th_exists)|quote|replace|s%(emver_matches|h%(a256%(_file)?|outy%(kebab|snake)case)|nakecase)|t%(itlecase|rim%(_%(end|start)%(_match%(es)?)?)?)|u%(pperca%(melca)?se|uid)|without_extension|invocation_directory%(_native)?|num_cpus|os%(_family)?)%(%(\s|\\\n)*\()@="
       \ matchgroup=justUserDefinedError start="\verror%(%(\s|\\\n)*\()@="
       \ matchgroup=justBuiltInFunctionsError start="\v\h[a-zA-Z0-9_-]*%(\s|\\\n)*\("
       \ contains=justNoise,@justExpr
 
 syn region justBuiltInFuncParamValue
       \ transparent end=')'
-      \ matchgroup=justFunction start="\v%(a%(bsolute_pat|rc)h|c%(apitalize|lean)|e%(nv%(_var%(_or_default)?)?|xtension)|file_%(name|stem)|j%(oin|ust%(_executable|file%(_directory)?))|kebabcase|lowerca%(melca)?se|pa%(rent_directory|th_exists)|quote|replace|s%(h%(a256%(_file)?|outy%(kebab|snake)case)|nakecase)|t%(itlecase|rim%(_%(end|start)%(_match%(es)?)?)?)|u%(pperca%(melca)?se|uid)|without_extension|invocation_directory%(_native)?|num_cpus|os%(_family)?)%(%(\s|\\\n)*\()@="
+      \ matchgroup=justFunction start="\v%(a%(bsolute_pat|rc)h|c%(apitalize|lean)|e%(nv%(_var%(_or_default)?)?|xtension)|file_%(name|stem)|j%(oin|ust%(_executable|file%(_directory)?))|kebabcase|lowerca%(melca)?se|pa%(rent_directory|th_exists)|quote|replace|s%(emver_matches|h%(a256%(_file)?|outy%(kebab|snake)case)|nakecase)|t%(itlecase|rim%(_%(end|start)%(_match%(es)?)?)?)|u%(pperca%(melca)?se|uid)|without_extension|invocation_directory%(_native)?|num_cpus|os%(_family)?)%(%(\s|\\\n)*\()@="
       \ matchgroup=justUserDefinedError start="\verror%(%(\s|\\\n)*\()@="
       \ matchgroup=justBuiltInFunctionsError start="\v\h[a-zA-Z0-9_-]*%(\s|\\\n)*\("
       \ contained
@@ -200,7 +200,7 @@ syn region justBuiltInFuncParamValue
 
 syn region justBuiltInFuncInInterp
       \ transparent end=')'
-      \ matchgroup=justFunction start="\v%(a%(bsolute_pat|rc)h|c%(apitalize|lean)|e%(nv%(_var%(_or_default)?)?|xtension)|file_%(name|stem)|j%(oin|ust%(_executable|file%(_directory)?))|kebabcase|lowerca%(melca)?se|pa%(rent_directory|th_exists)|quote|replace|s%(h%(a256%(_file)?|outy%(kebab|snake)case)|nakecase)|t%(itlecase|rim%(_%(end|start)%(_match%(es)?)?)?)|u%(pperca%(melca)?se|uid)|without_extension|invocation_directory%(_native)?|num_cpus|os%(_family)?)%(%(\s|\\\n)*\()@="
+      \ matchgroup=justFunction start="\v%(a%(bsolute_pat|rc)h|c%(apitalize|lean)|e%(nv%(_var%(_or_default)?)?|xtension)|file_%(name|stem)|j%(oin|ust%(_executable|file%(_directory)?))|kebabcase|lowerca%(melca)?se|pa%(rent_directory|th_exists)|quote|replace|s%(emver_matches|h%(a256%(_file)?|outy%(kebab|snake)case)|nakecase)|t%(itlecase|rim%(_%(end|start)%(_match%(es)?)?)?)|u%(pperca%(melca)?se|uid)|without_extension|invocation_directory%(_native)?|num_cpus|os%(_family)?)%(%(\s|\\\n)*\()@="
       \ matchgroup=justUserDefinedError start="\verror%(%(\s|\\\n)*\()@="
       \ matchgroup=justBuiltInFunctionsError start="\v\h[a-zA-Z0-9_-]*%(\s|\\\n)*\("
       \ contained
diff --git a/tests/cases/recipes-with-extras.html b/tests/cases/recipes-with-extras.html
index d9acb10..c0836f2 100644
--- a/tests/cases/recipes-with-extras.html
+++ b/tests/cases/recipes-with-extras.html
@@ -3,7 +3,7 @@
 
 p1 <span class="Operator">:=</span> <span class="String">'test'</span>
 p2 <span class="Operator">:=</span> <span class="String">'OtherTest'</span>
-param <span class="Operator">:=</span> <span class="String">'ThirdTest'</span>
+param <span class="Operator">:=</span> <span class="Function">semver_matches</span>(<span class="String">'0.1.1'</span>, <span class="String">'&gt;=0.1.0'</span>)
 
 <span class="Special">@</span><span class="Function">foo1</span> <span class="Identifier">param1</span> <span class="Identifier">param2</span><span class="Operator">=</span><span class="String">"default test"</span> <span class="Statement">+</span><span class="Identifier">varparam</span><span class="Operator">=</span><span class="String">'default'</span><span class="Operator">:</span> <span class="Function">dependency1</span> <span class="Delimiter">(</span><span class="Function">dependency2</span> p1 p2<span class="Delimiter">)</span> <span class="Delimiter">(</span><span class="Function">dependency3</span> param<span class="Delimiter">)</span>
 <span class="Number">  echo many lines</span>
diff --git a/tests/cases/recipes-with-extras.just b/tests/cases/recipes-with-extras.just
index 9a47a70..72f44ff 100644
--- a/tests/cases/recipes-with-extras.just
+++ b/tests/cases/recipes-with-extras.just
@@ -3,7 +3,7 @@ foo: # comment
 
 p1 := 'test'
 p2 := 'OtherTest'
-param := 'ThirdTest'
+param := semver_matches('0.1.1', '>=0.1.0')
 
 @foo1 param1 param2="default test" +varparam='default': dependency1 (dependency2 p1 p2) (dependency3 param)
   echo many lines