JSqlParser: Error while parsing literals with backslash

Describe the bug Can’t properly parse the statement when

1. Backslash is the last character of a literal;
2. The literal is not the last value of a sequence.

To Reproduce Steps to reproduce the behavior:

1. Example: CCJSqlParserUtil.parseStatements("""INSERT INTO "a"."b"("c", "d", "e") VALUES ('c c\', 'dd', 'ee\')""") (Kotlin)
2. Exception:

net.sf.jsqlparser.JSQLParserException: Encountered unexpected token: "dd" <S_IDENTIFIER>
    at line 1, column 53.

Was expecting one of:

    "&"
    ")"
    ","
    "::"
    "<<"
    ">>"
    "COLLATE"
    "["
    "^"
    "|"

1. Note that CCJSqlParserUtil.parseStatements("""INSERT INTO "a"."b"("c", "d", "e") VALUES ('c c', 'dd', 'ee\')""") won’t trigger the exception.

Expected behavior

The literals 'c c\' and 'dd'should be properly parsed.

System

• Database: Oracle
• Kotlin Version: 1.4.21-release-IJ2020.2-1
• Java Version: 1.8
• JSqlParser version: 4.0