fix: more python matching support (#1667)

syft/pkg/cataloger/binary/classifier.go

@@ -9,6 +9,7 @@ import (
 	"io"
 	"reflect"
 	"regexp"
+	"strings"
 	"text/template"
 
 	"github.com/anchore/packageurl-go"
@@ -79,6 +80,11 @@ func fileNameTemplateVersionMatcher(fileNamePattern string, contentTemplate stri
 
 		filepathNamedGroupValues := internal.MatchNamedCaptureGroups(pat, location.RealPath)
 
+		// versions like 3.5 should not match any character, but explicit dot
+		for k, v := range filepathNamedGroupValues {
+			filepathNamedGroupValues[k] = strings.ReplaceAll(v, ".", "\\.")
+		}
+
 		tmpl, err := template.New("").Parse(contentTemplate)
 		if err != nil {
 			return nil, fmt.Errorf("unable to parse classifier template=%q : %w", contentTemplate, err)