diff --git a/src/collection.cpp b/src/collection.cpp
index ff14fcfa..92edf037 100644
--- a/src/collection.cpp
+++ b/src/collection.cpp
@@ -4870,7 +4870,7 @@ bool Collection::get_enable_nested_fields() {
 
 Option<bool> Collection::parse_facet(const std::string& facet_field, std::vector<facet>& facets) const{
    const std::regex base_pattern(".+\\(.*\\)");
-   const std::regex range_pattern("[[a-zA-Z]+:\\[([+-]?([0-9]*[.])?[0-9]*)\\,\\s*([+-]?([0-9]*[.])?[0-9]*)\\]");
+   const std::regex range_pattern("[[a-z A-Z]+:\\[([+-]?([0-9]*[.])?[0-9]*)\\,\\s*([+-]?([0-9]*[.])?[0-9]*)\\]");
    
    if(facet_field.find(":") != std::string::npos) { //range based facet
         if(!std::regex_match(facet_field, base_pattern)){