Allow settings values to contain equals signs

Adjusted the regexp to allow equals signs in values.
Allows parsing of settings like: `SQLDataSourceName=/quickfix?parseTime=true&loc=UTC`.

Author: mgatny

settings.go

@@ -3,9 +3,10 @@ package quickfix
 import (
 	"bufio"
 	"fmt"
-	"github.com/quickfixgo/quickfix/config"
 	"io"
 	"regexp"
+
+	"github.com/quickfixgo/quickfix/config"
 )
 
 //The Settings type represents a collection of global and session settings.
@@ -67,7 +68,7 @@ func ParseSettings(reader io.Reader) (*Settings, error) {
 	commentRegEx := regexp.MustCompile(`^#.*`)
 	defaultRegEx := regexp.MustCompile(`^\[(?i)DEFAULT\]\s*$`)
 	sessionRegEx := regexp.MustCompile(`^\[(?i)SESSION\]\s*$`)
-	settingRegEx := regexp.MustCompile(`^(.*)=(.*)$`)
+	settingRegEx := regexp.MustCompile(`^([^=]*)=(.*)$`)
 
 	var settings *SessionSettings
 

settings_test.go

@@ -1,9 +1,12 @@
 package quickfix
 
 import (
-	"github.com/quickfixgo/quickfix/config"
 	"strings"
 	"testing"
+
+	"github.com/quickfixgo/quickfix/config"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 func TestSettings_New(t *testing.T) {
@@ -266,6 +269,27 @@ DataDictionary=somewhere/FIX42.xml
 	}
 }
 
+func TestSettings_ParseSettings_WithEqualsSignInValue(t *testing.T) {
+	s, err := ParseSettings(strings.NewReader(`
+[DEFAULT]
+ConnectionType=initiator
+SQLDriver=mysql
+SQLDataSourceName=root:root@/quickfix?parseTime=true&loc=UTC
+
+[SESSION]
+BeginString=FIX.4.2
+SenderCompID=SENDER
+TargetCompID=TARGET`))
+
+	require.Nil(t, err)
+	require.NotNil(t, s)
+
+	sessionSettings := s.SessionSettings()[SessionID{BeginString: "FIX.4.2", SenderCompID: "SENDER", TargetCompID: "TARGET"}]
+	val, err := sessionSettings.Setting("SQLDataSourceName")
+	assert.Nil(t, err)
+	assert.Equal(t, `root:root@/quickfix?parseTime=true&loc=UTC`, val)
+}
+
 func TestSettings_SessionIDFromSessionSettings(t *testing.T) {
 	var testCases = []struct {
 		globalBeginString   string