fix some more edge cases

test.sh

@@ -115,6 +115,12 @@ qwerty.*$
 a(?:b|c|d){4,5}(.)
 (?:c|d)(?:)(?:a(?:)(?:b)(?:b(?:))(?:b(?:)(?:b)))
 \\\\<abc
+a\\\\([COM]+\\\\)|([A-Za-z_%.]+):
+xyz\\\\([COM]+\\\\)|(abcd[A-Za-z_%.]+):cd
+aaaaa(aa)aa(aa(a)a)?aa
+^\\\\.+(((/)\\\\.\\\\.+)+)?
+^(http|https|ftp):[/]{2}([a-zA-Z0-9\\\\\\\\.]+\\\\.[a-zA-Z]{2,4})(:[0-9]+)?/?([a-zA-Z0-9\\\\\\\\._?,'/+&amp;%$#=~]*)
+(\\\\$\\\\([a-zA-Z0-9_]+\\\\))|(([A-Za-z_%.]+):)
 "
 input="\
 abcdef
@@ -231,6 +237,12 @@ abcd
 acdbcdbe
 cabbbb
 dabc
+a(COM:=.o):
+xyz(abcdCOM:cd):
+aaaaaaaaaaaaaaaaaaaaaaaaa
+../../..
+https://kyryl.tk/404
+OBJ = \$(SRC:.c=.o)
 "
 expect="\
 (0,3)
@@ -347,6 +359,12 @@ expect="\
 (0,7)(6,7)
 (0,6)
 -nomatch-
+(2,6)(2,5)
+(4,14)(4,11)
+(0,15)(5,7)(9,13)(11,12)
+(0,8)(2,8)(5,8)(5,6)
+(0,20)(0,5)(8,16)(?,?)(17,20)
+(8,12)(?,?)(8,12)(8,11)
 (0,0)
 "