- [+] add regular expression support

compliance/functions.json

@@ -127,6 +127,18 @@
       "expression": "contains(decimals, `false`)",
       "result": false
     },
+    {
+      "expression": "matches('This and these', 't(his|h[eo]se)')",
+      "result": true
+    },
+    {
+      "expression": "matches('Those people', 't(his|h[eo]se)')",
+      "result": false
+    },
+    {
+      "expression": "matches('THOSE people', '(?i)t(his|h[eo]se)')",
+      "result": true
+    },
     {
       "expression": "ends_with(str, 'r')",
       "result": true

functions.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"math"
 	"reflect"
+	"regexp"
 	"sort"
 	"strconv"
 	"strings"
@@ -169,6 +170,14 @@ func newFunctionCaller() *functionCaller {
 			},
 			handler: jpfContains,
 		},
+		"matches": {
+			name: "matches",
+			arguments: []argSpec{
+				{types: []jpType{jpString}},
+				{types: []jpType{jpString}},
+			},
+			handler: jpfMatches,
+		},
 		"ends_with": {
 			name: "ends_with",
 			arguments: []argSpec{
@@ -458,6 +467,15 @@ func jpfContains(arguments []interface{}) (interface{}, error) {
 	}
 	return false, nil
 }
+func jpfMatches(arguments []interface{}) (interface{}, error) {
+	search := arguments[0].(string)
+	rgexp := arguments[1].(string)
+	r, err := regexp.Compile(rgexp)
+	if err != nil {
+		return false, err
+	}
+	return r.MatchString(search), nil
+}
 func jpfEndsWith(arguments []interface{}) (interface{}, error) {
 	search := arguments[0].(string)
 	suffix := arguments[1].(string)