VS Code Regular Expression Search only UPPERCASE letters

In VS Code I want to make the following search and replace, but it is not matching only uppercase letters. Is this a bug/deficiency or am I missing something?

Find: \{\$([A-Z_]+)\}
Replace: {$1}

so this:

$(document).ready(function () 
{
    generarEstado('{$GRAPH_BY_STATUS} ','{$nombreSitio}','{$nombreSitioCorto}');
    generarSexo('{$GRAPH_BY_SEX} ','{$nombreSitio}','{$nombreSitioCorto}');
    generarSexGrade('{$GRAPH_BY_SEX_AND_GRADE} ','{$nombreSitio}','{$nombreSitioCorto}');
});

Should become:

$(document).ready(function () 
{
    generarEstado('{GRAPH_BY_STATUS} ','{$nombreSitio}','{$nombreSitioCorto}');
    generarSexo('{GRAPH_BY_SEX} ','{$nombreSitio}','{$nombreSitioCorto}');
    generarSexGrade('{GRAPH_BY_SEX_AND_GRADE} ','{$nombreSitio}','{$nombreSitioCorto}');
});

but it is also matching the others {$nombreSitio} and {$nombreSitioCorto} etc

Make sure in your find and replace options that in addition to doing a reg ex match, that you also have the "Match Case" option checked. Personally, I think that behavior is weird. If you pick regex, it should use a regex, not a case insensitive regex, but that's the way it works apparently. See: https://github.com/Microsoft/vscode/issues/6993