diff --git a/dsl.go b/dsl.go
new file mode 100644
index 000000000..123f25b12
--- /dev/null
+++ b/dsl.go
@@ -0,0 +1,153 @@
+package generators
+
+import (
+	"crypto/md5"
+	"crypto/sha1"
+	"crypto/sha256"
+	"encoding/base64"
+	"encoding/hex"
+	"html"
+	"net/url"
+	"regexp"
+	"strings"
+        "log"
+	"github.com/Knetic/govaluate"
+)
+
+// HelperFunctions contains the dsl functions
+func HelperFunctions() (functions map[string]govaluate.ExpressionFunction) {
+	functions = make(map[string]govaluate.ExpressionFunction)
+
+	// strings
+	functions["len"] = func(args ...interface{}) (interface{}, error) {
+		length := len(args[0].(string))
+
+		return float64(length), nil
+	}
+
+	functions["toupper"] = func(args ...interface{}) (interface{}, error) {
+		return strings.ToUpper(args[0].(string)), nil
+	}
+
+	functions["tolower"] = func(args ...interface{}) (interface{}, error) {
+		return strings.ToLower(args[0].(string)), nil
+	}
+
+	functions["replace"] = func(args ...interface{}) (interface{}, error) {
+		return strings.ReplaceAll(args[0].(string), args[1].(string), args[2].(string)), nil
+	}
+
+	functions["trim"] = func(args ...interface{}) (interface{}, error) {
+		return strings.Trim(args[0].(string), args[2].(string)), nil
+	}
+
+	functions["trimleft"] = func(args ...interface{}) (interface{}, error) {
+		return strings.TrimLeft(args[0].(string), args[1].(string)), nil
+	}
+
+	functions["trimright"] = func(args ...interface{}) (interface{}, error) {
+		return strings.TrimRight(args[0].(string), args[1].(string)), nil
+	}
+
+	functions["trimspace"] = func(args ...interface{}) (interface{}, error) {
+		return strings.TrimSpace(args[0].(string)), nil
+	}
+
+	functions["trimprefix"] = func(args ...interface{}) (interface{}, error) {
+		return strings.TrimPrefix(args[0].(string), args[1].(string)), nil
+	}
+
+	functions["trimsuffix"] = func(args ...interface{}) (interface{}, error) {
+		return strings.TrimSuffix(args[0].(string), args[1].(string)), nil
+	}
+
+	functions["reverse"] = func(args ...interface{}) (interface{}, error) {
+		return reverseString(args[0].(string)), nil
+	}
+
+	// encoding
+	functions["base64"] = func(args ...interface{}) (interface{}, error) {
+		sEnc := base64.StdEncoding.EncodeToString([]byte(args[0].(string)))
+
+		return sEnc, nil
+	}
+
+        functions["base64_decode"] = func(args ...interface{}) (interface{}, error) {
+                sDec, err := base64.StdEncoding.DecodeString(args[0].(string))
+                if err != nil {
+                log.Fatal("error:", err)
+                }
+
+                return sDec, nil
+        }
+
+	functions["url_encode"] = func(args ...interface{}) (interface{}, error) {
+		return url.PathEscape(args[0].(string)), nil
+	}
+
+	functions["url_decode"] = func(args ...interface{}) (interface{}, error) {
+		return url.PathUnescape(args[0].(string))
+	}
+
+	functions["hex_encode"] = func(args ...interface{}) (interface{}, error) {
+		return hex.EncodeToString([]byte(args[0].(string))), nil
+	}
+
+	functions["hex_decode"] = func(args ...interface{}) (interface{}, error) {
+		hx, _ := hex.DecodeString(args[0].(string))
+		return string(hx), nil
+	}
+
+	functions["html_escape"] = func(args ...interface{}) (interface{}, error) {
+		return html.EscapeString(args[0].(string)), nil
+	}
+
+	functions["html_unescape"] = func(args ...interface{}) (interface{}, error) {
+		return html.UnescapeString(args[0].(string)), nil
+	}
+
+	// hashing
+	functions["md5"] = func(args ...interface{}) (interface{}, error) {
+		hash := md5.Sum([]byte(args[0].(string)))
+
+		return hex.EncodeToString(hash[:]), nil
+	}
+
+	functions["sha256"] = func(args ...interface{}) (interface{}, error) {
+		h := sha256.New()
+		_, err := h.Write([]byte(args[0].(string)))
+
+		if err != nil {
+			return nil, err
+		}
+
+		return hex.EncodeToString(h.Sum(nil)), nil
+	}
+
+	functions["sha1"] = func(args ...interface{}) (interface{}, error) {
+		h := sha1.New()
+		_, err := h.Write([]byte(args[0].(string)))
+
+		if err != nil {
+			return nil, err
+		}
+
+		return hex.EncodeToString(h.Sum(nil)), nil
+	}
+
+	// search
+	functions["contains"] = func(args ...interface{}) (interface{}, error) {
+		return strings.Contains(args[0].(string), args[1].(string)), nil
+	}
+
+	functions["regex"] = func(args ...interface{}) (interface{}, error) {
+		compiled, err := regexp.Compile(args[0].(string))
+		if err != nil {
+			return nil, err
+		}
+
+		return compiled.MatchString(args[1].(string)), nil
+	}
+
+	return functions
+}