diff -ur v17/ezyaml.c v18/ezyaml.c
--- v17/ezyaml.c	2018-09-10 21:21:46.000000000 +0900
+++ v18/ezyaml.c	2018-09-12 22:20:36.000000000 +0900
@@ -146,15 +146,21 @@
 }
 
 int
-find_idx(char *s, char c)
+find_idx(char *s, char *t)
 {
 	int idx = 0;
 	struct obj *lst = parse(s);
+
+	s = lines_top_str(lst);
+	if( s && is_qts(s[0]) ){
+		list_pop_top(lst);
+		idx += strlen(s);
+	}
 	while( list_len(lst) > 0 ){
 		struct obj *str = list_pop_top(lst);
 		s = obj_buf(str);
-		if( !is_qts(*s) && strchr(s, c) ){
-			return idx + ( strchr(s, c) - s );
+		if( strstr(s, t) ){
+			return idx + ( strstr(s, t) - s );
 		}
 		idx += strlen(s);
 	}
@@ -164,7 +170,13 @@
 int
 find_colon_idx(char *s)
 {
-	return find_idx(s, ':');
+	int n;
+	int idx = find_idx(s, ": ");
+	if(idx >= 0){
+		return idx;
+	}
+	n = strlen(s);
+	return n > 0 && s[n-1] == ':' ? n-1 : -1;
 }
 
 #define TYP_OTHER	(-1)
@@ -543,7 +555,16 @@
 }
 
 int
-need_quote(char *s)
+is_not_same_str(char *s, struct obj *obj)
+{
+	struct obj *v = get_value(s);
+	int r = !obj_eq(v, obj);
+	obj_del(v);
+	return r;
+}
+
+int
+need_quote(char *s, struct obj *obj, int from_dic)
 {
 	char h, t;
 
@@ -556,25 +577,13 @@
 	if( (h == '[' && t == ']') || (h == '{' && t == '}') ){
 		return 1;
 	}
-	return 0;
-}
-
-int
-is_not_same_str(char *s, struct obj *obj)
-{
-	struct obj *v = get_value(s);
-	int r = !obj_eq(v, obj);
-	obj_del(v);
-	return r;
-}
-
-char *
-sel_quote(int q2, int q1, int cl, char *s, struct obj *obj)
-{
-	if(q2 || q1 || cl || is_not_same_str(s, obj) || need_quote(s) ){
-		return q1 ? "\"" : "'";
+	if( is_not_same_str(s, obj) ){
+		return 1;
 	}
-	return NULL;
+	if( from_dic == 'l' && ( strstr(s, ": ") || s[ strlen(s)-1 ] == ':' ) ){
+		return 1;
+	}
+	return 0;
 }
 
 struct obj *
@@ -582,37 +591,16 @@
 {
 	if(obj->typ == OBJ_TYP_STR){
 		struct obj *str;
-		char *qt;
 		char *s = strdup( obj_buf(obj) );
-		int q2 = strchr(s, '"') != NULL;
-		int q1 = strchr(s, '\'') != NULL;
-		int cl = strchr(s, ':') != NULL;
-
-		if(cl && from_dic == 'r'){
-			char *t = s;
-			cl = 0;
-			while( ( t = strchr(t, ':') ) ){
-				t++;
-				if(*t == '\0' || t[0] == ' '){
-					cl = 1;
-					break;
-				}
-			}
-		}
-		if(q2 && q1){
-			s = cp_replace(s, "'", "\\'");
-			q1 = 0;
-		}
-		if(from_dic != 'l'){
-			if(q1 && !sel_quote(q2, 0, cl, s, obj)){
+		if( need_quote(s, obj, from_dic) ){
+			char *qt;
+			int q2 = strchr(s, '"') != NULL;
+			int q1 = strchr(s, '\'') != NULL;
+			if(q2 && q1){
+				s = cp_replace(s, "'", "\\'");
 				q1 = 0;
 			}
-			if(q2 && !sel_quote(0, q1, cl, s, obj)){
-				q2 = 0;
-			}
-		}
-		qt = sel_quote(q2, q1, cl, s, obj);
-		if(qt){
+			qt = q1 ? "\"" : "'";
 			s = cp_add( strdup(qt), s );
 			s = cp_add( s, strdup(qt) );
 		}
diff -ur v17/ezyaml.py v18/ezyaml.py
--- v17/ezyaml.py	2018-09-10 21:21:43.000000000 +0900
+++ v18/ezyaml.py	2018-09-12 22:20:36.000000000 +0900
@@ -41,17 +41,22 @@
 		lst.pop()
 	return lst
 
-def find_idx(s, c):
+def find_idx(s, t):
 	idx = 0
 	lst = parse(s)
+	if lst and lst[0][:1] in qts:
+		idx += len( lst.pop(0) )
 	for s in lst:
-		if ( s[:1] not in qts  ) and ( c in s ):
-			return idx + s.index(c)
+		if t in s:
+			return idx + s.index(t)
 		idx += len(s)
 	return -1
 
 def find_colon_idx(s):
-	return find_idx(s, ':')
+	idx = find_idx(s, ': ')
+	if idx >= 0:
+		return idx
+	return len(s)-1 if s[-1:] == ':' else -1
 
 def get_kind(s):
 	if s.startswith('- '):
@@ -218,7 +223,7 @@
 		lines.append(s)
 	return '\n'.join(lines)
 
-def need_quote(s):
+def need_quote(s, obj, from_dic):
 	if s in [''] + kwd_true + kwd_false:
 		return True
 
@@ -226,35 +231,23 @@
 	if ( s[:1], s[-1:] ) in hts:
 		return True	
 
-	return False
+	if get_value(s) != obj:
+		return True
 
-def sel_quote(q2, q1, cl, s, obj):
-	if q2 or q1 or cl or get_value(s) != obj or need_quote(s):
-		return '"' if q1 else "'"
-	return ''
+	if from_dic == 'l' and (': ' in s or s[-1:] == ':'):
+		return True
+
+	return False
 
 def dump_value(obj, from_dic=None):
 	if type(obj) == str:
 		s = obj
-		(q2, q1, cl) = map( lambda t: t in s, ('"', "'", ':') )
-		if cl and from_dic == 'r':
-			t = s
-			cl = False
-			while ':' in t:
-				t = t[ t.index(':')+1 : ]
-				if not t or t[0] == ' ':
-					cl = True
-					break
-		if q2 and q1:
-			s = s.replace("'", "\\'")
-			q1 = False
-		if from_dic != 'l':
-			if q1 and not sel_quote(q2, False, cl, s, obj):
+		if need_quote(s, obj, from_dic):
+			(q2, q1) = map( lambda t: t in s, ('"', "'") )
+			if q2 and q1:
+				s = s.replace("'", "\\'")
 				q1 = False
-			if q2 and not sel_quote(False, q1, cl, s, obj):
-				q2 = False
-		qt = sel_quote(q2, q1, cl, s, obj)
-		if qt:
+			qt = '"' if q1 else "'"
 			s = qt + s + qt
 		return s