# YAML Test Matrix

--- &test-55WF
  Title: Invalid escape in double quoted string
  Tags: [ double, error ]

YAML

---
"\."

Expected Events

+STR
+DOC ---

Expected JSON



perl-syck-json

 invalid_incorrect
"\\."

perl-syck-perl

 invalid_incorrect
'\\.'

c-libfyaml-event

 invalid_correct
stdin:2:2: error: invalid escape '.' in double-quoted string
"\."
 ^~
[NOT]: fy_fetch_flow_scalar() failed
[NOT]: fy_fetch_tokens() failed
[NOT]: failed to peek token
+STR
+DOC ---

c-libfyaml-json

 invalid_correct
stdin:2:2: error: invalid escape '.' in double-quoted string
"\."
 ^~
[NOT]: fy_fetch_flow_scalar() failed
[NOT]: fy_fetch_tokens() failed
[NOT]: failed to peek token

c-libyaml-event

 invalid_correct
Parse error: found unknown escape character
+STR
+DOC ---

cpp-yamlcpp-event

 invalid_correct
Exception:
yaml-cpp: error at line 2, column 4: unknown escape character: .
+STR
+DOC

dotnet-yamldotnet-event

 invalid_correct
Unhandled exception. YamlDotNet.Core.SyntaxErrorException: (Line: 2, Col: 1, Idx: 4) - (Line: 2, Col: 2, Idx: 5): While scanning a quoted scalar, found unknown escape character.
   at YamlDotNet.Core.Scanner.ScanFlowScalar(Boolean isSingleQuoted)
   at YamlDotNet.Core.Scanner.FetchFlowScalar(Boolean isSingleQuoted)
   at YamlDotNet.Core.Scanner.FetchNextToken()
   at YamlDotNet.Core.Scanner.FetchMoreTokens()
   at YamlDotNet.Core.Scanner.MoveNextWithoutConsuming()
   at YamlDotNet.Core.Parser.GetCurrentToken()
   at YamlDotNet.Core.Parser.ParseDocumentContent()
   at YamlDotNet.Core.Parser.StateMachine()
   at YamlDotNet.Core.Parser.MoveNext()
   at YamlDotNet.RepresentationModel.LibYamlEventStream.WriteTo(TextWriter textWriter)
   at Program.Main(String[] commandLineArguments)
Aborted (core dumped)
+STR
+DOC ---

dotnet-yamldotnet-json

 invalid_correct
Unhandled exception. YamlDotNet.Core.SyntaxErrorException: (Line: 2, Col: 1, Idx: 4) - (Line: 2, Col: 2, Idx: 5): While scanning a quoted scalar, found unknown escape character.
   at YamlDotNet.Core.Scanner.ScanFlowScalar(Boolean isSingleQuoted)
   at YamlDotNet.Core.Scanner.FetchFlowScalar(Boolean isSingleQuoted)
   at YamlDotNet.Core.Scanner.FetchNextToken()
   at YamlDotNet.Core.Scanner.FetchMoreTokens()
   at YamlDotNet.Core.Scanner.MoveNextWithoutConsuming()
   at YamlDotNet.Core.Parser.GetCurrentToken()
   at YamlDotNet.Core.Parser.ParseDocumentContent()
   at YamlDotNet.Core.Parser.StateMachine()
   at YamlDotNet.Core.Parser.MoveNext()
   at YamlDotNet.Core.ParserExtensions.TryConsume[T](IParser parser, T& event)
   at YamlDotNet.Serialization.Deserializer.Deserialize(IParser parser, Type type)
   at YamlDotNet.Serialization.Deserializer.Deserialize(TextReader input, Type type)
   at YamlDotNet.Serialization.Deserializer.Deserialize(TextReader input)
   at Program.Main(String[] commandLineArguments)
Aborted (core dumped)

hs-hsyaml-event

 invalid_correct
Parsing error near byte offset Pos {posByteOffset = 4, posCharOffset = 4, posLine = 2, posColumn = 0} (Lexical error near "\"\\.\"")
+STR
+DOC ---
=VAL :

hs-hsyaml-json

 invalid_correct
hsyaml-parser: user error (Lexical error near "\"\\.\"")

java-snakeyaml-event

 invalid_correct
Exception in thread "main" while scanning a double-quoted scalar
 in 'reader', line 2, column 1:
    "\."
    ^
found unknown escape character .(46)
 in 'reader', line 2, column 3:
    "\."
      ^

	at org.yaml.snakeyaml.scanner.ScannerImpl.scanFlowScalarNonSpaces(ScannerImpl.java:1965)
	at org.yaml.snakeyaml.scanner.ScannerImpl.scanFlowScalar(ScannerImpl.java:1901)
	at org.yaml.snakeyaml.scanner.ScannerImpl.fetchFlowScalar(ScannerImpl.java:1048)
	at org.yaml.snakeyaml.scanner.ScannerImpl.fetchDouble(ScannerImpl.java:1030)
	at org.yaml.snakeyaml.scanner.ScannerImpl.fetchMoreTokens(ScannerImpl.java:415)
	at org.yaml.snakeyaml.scanner.ScannerImpl.checkToken(ScannerImpl.java:248)
	at org.yaml.snakeyaml.parser.ParserImpl$ParseDocumentContent.produce(ParserImpl.java:304)
	at org.yaml.snakeyaml.parser.ParserImpl.peekEvent(ParserImpl.java:165)
	at org.yaml.snakeyaml.Yaml$3.hasNext(Yaml.java:677)
	at org.yaml.editor.Snake2Events.yamlToEvents(Snake2Events.java:111)
	at org.yaml.editor.Snake2Events.main(Snake2Events.java:119)

java-snakeyaml-json

 invalid_correct
Exception in thread "main" while scanning a double-quoted scalar
 in 'reader', line 2, column 1:
    "\."
    ^
found unknown escape character .(46)
 in 'reader', line 2, column 3:
    "\."
      ^

	at org.yaml.snakeyaml.scanner.ScannerImpl.scanFlowScalarNonSpaces(ScannerImpl.java:1965)
	at org.yaml.snakeyaml.scanner.ScannerImpl.scanFlowScalar(ScannerImpl.java:1901)
	at org.yaml.snakeyaml.scanner.ScannerImpl.fetchFlowScalar(ScannerImpl.java:1048)
	at org.yaml.snakeyaml.scanner.ScannerImpl.fetchDouble(ScannerImpl.java:1030)
	at org.yaml.snakeyaml.scanner.ScannerImpl.fetchMoreTokens(ScannerImpl.java:415)
	at org.yaml.snakeyaml.scanner.ScannerImpl.checkToken(ScannerImpl.java:248)
	at org.yaml.snakeyaml.parser.ParserImpl$ParseDocumentContent.produce(ParserImpl.java:304)
	at org.yaml.snakeyaml.parser.ParserImpl.peekEvent(ParserImpl.java:165)
	at org.yaml.snakeyaml.comments.CommentEventsCollector$1.peek(CommentEventsCollector.java:59)
	at org.yaml.snakeyaml.comments.CommentEventsCollector$1.peek(CommentEventsCollector.java:45)
	at org.yaml.snakeyaml.comments.CommentEventsCollector.collectEvents(CommentEventsCollector.java:140)
	at org.yaml.snakeyaml.comments.CommentEventsCollector.collectEvents(CommentEventsCollector.java:119)
	at org.yaml.snakeyaml.composer.Composer.composeNode(Composer.java:157)
	at org.yaml.snakeyaml.composer.Composer.getNode(Composer.java:115)
	at org.yaml.snakeyaml.constructor.BaseConstructor.getData(BaseConstructor.java:135)
	at org.yaml.snakeyaml.Yaml$1.next(Yaml.java:514)
	at org.yaml.editor.Snake2Json.yamlToJson(Snake2Json.java:18)
	at org.yaml.editor.Snake2Json.main(Snake2Json.java:25)

js-jsyaml-json

 invalid_correct
/node/node_modules/js-yaml/lib/loader.js:187
  throw generateError(state, message);
  ^
YAMLException: unknown escape sequence (2:3)

 1 | ---
 2 | "\."
-------^
    at generateError (/node/node_modules/js-yaml/lib/loader.js:183:10)
    at throwError (/node/node_modules/js-yaml/lib/loader.js:187:9)
    at readDoubleQuotedScalar (/node/node_modules/js-yaml/lib/loader.js:684:9)
    at composeNode (/node/node_modules/js-yaml/lib/loader.js:1447:13)
    at readBlockMapping (/node/node_modules/js-yaml/lib/loader.js:1104:12)
    at composeNode (/node/node_modules/js-yaml/lib/loader.js:1441:12)
    at readDocument (/node/node_modules/js-yaml/lib/loader.js:1625:3)
    at loadDocuments (/node/node_modules/js-yaml/lib/loader.js:1688:5)
    at Object.loadAll (/node/node_modules/js-yaml/lib/loader.js:1701:19)
    at Object.<anonymous> (/yaml/bin/js-jsyaml-json:7:13)

js-yaml-event

 invalid_correct
Invalid escape sequence \. at line 2, column 2:

"\."
 ^
+STR
+DOC ---
=VAL "\\.
-DOC
-STR

js-yaml-json

 invalid_correct
/yaml/bin/js-yaml-json:8
  if (doc.errors.length !== 0) throw doc.errors[0]
                               ^

YAMLParseError: Invalid escape sequence \. at line 2, column 2:

"\."
 ^

    at Composer.onError (/node/node_modules/yaml/dist/compose/composer.js:71:34)
    at _onError (/node/node_modules/yaml/dist/compose/resolve-flow-scalar.js:10:42)
    at doubleQuotedValue (/node/node_modules/yaml/dist/compose/resolve-flow-scalar.js:153:17)
    at Object.resolveFlowScalar (/node/node_modules/yaml/dist/compose/resolve-flow-scalar.js:22:21)
    at Object.composeScalar (/node/node_modules/yaml/dist/compose/compose-scalar.js:11:29)
    at Object.composeNode (/node/node_modules/yaml/dist/compose/compose-node.js:23:34)
    at Object.composeDoc (/node/node_modules/yaml/dist/compose/compose-doc.js:31:23)
    at Composer.next (/node/node_modules/yaml/dist/compose/composer.js:152:40)
    at next (<anonymous>)
    at Composer.compose (/node/node_modules/yaml/dist/compose/composer.js:134:25)

lua-lyaml-json

 invalid_correct
luajit: 1:1: found unknown escape character
stack traceback:
	[C]: in function 'error'
	/usr/local/share/lua/5.1/lyaml/init.lua:306: in function 'error'
	/usr/local/share/lua/5.1/lyaml/init.lua:325: in function 'parse'
	/usr/local/share/lua/5.1/lyaml/init.lua:443: in function 'load_node'
	/usr/local/share/lua/5.1/lyaml/init.lua:497: in function 'load'
	/yaml/bin/lua-lyaml-json:6: in main chunk
	[C]: at 0x5608e14d0f97

nim-nimyaml-event

 invalid_correct
/tmp/NimYAML-0.16.0/yaml/stream.nim(134) nimyaml_event
/tmp/NimYAML-0.16.0/yaml/stream.nim(106) next
Error: unhandled exception: Illegal character in escape sequence: "." [YamlStreamError]
+STR
+DOC ---

perl-pp-event

 invalid_correct
Line      : 2
Column    : 2
Message   : Invalid quoted <"> string
Where     : /perl5/lib/perl5/YAML/PP/Lexer.pm line 738
YAML      : "\\.\""
  at /yaml/bin/perl-pp-event line 25.
+STR
+DOC ---

perl-pp-json

 invalid_correct
Line      : 2
Column    : 2
Message   : Invalid quoted <"> string
Where     : /perl5/lib/perl5/YAML/PP/Lexer.pm line 738
YAML      : "\\.\""
  at /perl5/lib/perl5/YAML/PP/Loader.pm line 94.

perl-pp-perl

 invalid_correct
Line      : 2
Column    : 2
Message   : Invalid quoted <"> string
Where     : /perl5/lib/perl5/YAML/PP/Lexer.pm line 738
YAML      : "\\.\""
  at /perl5/lib/perl5/YAML/PP/Loader.pm line 94.

perl-pplibyaml-event

 invalid_correct
YAML::PP::LibYAML Error: The problem:

    found unknown escape character

was found at , line: 2, column: 2
while parsing a quoted scalar at line: 2, column: 1

perl-pplibyaml-json

 invalid_correct
YAML::PP::LibYAML Error: The problem:

    found unknown escape character

was found at , line: 2, column: 2
while parsing a quoted scalar at line: 2, column: 1

perl-pplibyaml-perl

 invalid_correct
YAML::PP::LibYAML Error: The problem:

    found unknown escape character

was found at , line: 2, column: 2
while parsing a quoted scalar at line: 2, column: 1

perl-refparser-event

 invalid_correct
Parser finished before end of input at /perl5/lib/perl5/YAML/Parser.pm line 4047, <> line 1.

perl-tiny-json

 invalid_correct
YAML::Tiny failed to classify line '"\."' at /yaml/bin/perl-tiny-json line 12.

perl-tiny-perl

 invalid_correct
YAML::Tiny failed to classify line '"\."' at /yaml/bin/perl-tiny-perl line 15.

perl-xs-json

 invalid_correct
YAML::XS::Load Error: The problem:

    found unknown escape character

was found at document: 1, line: 2, column: 2
while parsing a quoted scalar at line: 2, column: 1

perl-xs-perl

 invalid_correct
YAML::XS::Load Error: The problem:

    found unknown escape character

was found at document: 1, line: 2, column: 2
while parsing a quoted scalar at line: 2, column: 1

perl-yaml-json

 invalid_correct
YAML Error: Expected separator '---'
   Code: YAML_PARSE_ERR_NO_SEPARATOR
   Line: 2
   Document: 2
 at /perl5/lib/perl5/YAML/Loader.pm line 88.

perl-yaml-perl

 invalid_correct
YAML Error: Expected separator '---'
   Code: YAML_PARSE_ERR_NO_SEPARATOR
   Line: 2
   Document: 2
 at /perl5/lib/perl5/YAML/Loader.pm line 88.

py-pyyaml-event

 invalid_correct
Traceback (most recent call last):
  File "/yaml/bin/py-pyyaml-event", line 7, in <module>
    for event in yaml.parse(sys.stdin.read()):
  File "/python/lib/python3.7/site-packages/yaml/__init__.py", line 75, in parse
    while loader.check_event():
  File "/python/lib/python3.7/site-packages/yaml/parser.py", line 98, in check_event
    self.current_event = self.state()
  File "/python/lib/python3.7/site-packages/yaml/parser.py", line 210, in parse_document_content
    DocumentStartToken, DocumentEndToken, StreamEndToken):
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 116, in check_token
    self.fetch_more_tokens()
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 251, in fetch_more_tokens
    return self.fetch_double()
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 655, in fetch_double
    self.fetch_flow_scalar(style='"')
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 666, in fetch_flow_scalar
    self.tokens.append(self.scan_flow_scalar(style))
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 1149, in scan_flow_scalar
    chunks.extend(self.scan_flow_scalar_non_spaces(double, start_mark))
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 1224, in scan_flow_scalar_non_spaces
    "found unknown escape character %r" % ch, self.get_mark())
yaml.scanner.ScannerError: while scanning a double-quoted scalar
  in "<unicode string>", line 2, column 1:
    "\."
    ^
found unknown escape character '.'
  in "<unicode string>", line 2, column 3:
    "\."
      ^
+STR
+DOC ---

py-pyyaml-json

 invalid_correct
Traceback (most recent call last):
  File "/yaml/bin/py-pyyaml-json", line 19, in <module>
    for doc in yaml.load_all(sys.stdin.read(), Loader=yaml.FullLoader):
  File "/python/lib/python3.7/site-packages/yaml/__init__.py", line 130, in load_all
    yield loader.get_data()
  File "/python/lib/python3.7/site-packages/yaml/constructor.py", line 45, in get_data
    return self.construct_document(self.get_node())
  File "/python/lib/python3.7/site-packages/yaml/composer.py", line 27, in get_node
    return self.compose_document()
  File "/python/lib/python3.7/site-packages/yaml/composer.py", line 55, in compose_document
    node = self.compose_node(None, None)
  File "/python/lib/python3.7/site-packages/yaml/composer.py", line 64, in compose_node
    if self.check_event(AliasEvent):
  File "/python/lib/python3.7/site-packages/yaml/parser.py", line 98, in check_event
    self.current_event = self.state()
  File "/python/lib/python3.7/site-packages/yaml/parser.py", line 210, in parse_document_content
    DocumentStartToken, DocumentEndToken, StreamEndToken):
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 116, in check_token
    self.fetch_more_tokens()
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 251, in fetch_more_tokens
    return self.fetch_double()
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 655, in fetch_double
    self.fetch_flow_scalar(style='"')
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 666, in fetch_flow_scalar
    self.tokens.append(self.scan_flow_scalar(style))
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 1149, in scan_flow_scalar
    chunks.extend(self.scan_flow_scalar_non_spaces(double, start_mark))
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 1224, in scan_flow_scalar_non_spaces
    "found unknown escape character %r" % ch, self.get_mark())
yaml.scanner.ScannerError: while scanning a double-quoted scalar
  in "<unicode string>", line 2, column 1:
    "\."
    ^
found unknown escape character '.'
  in "<unicode string>", line 2, column 3:
    "\."
      ^

py-pyyaml-py

 invalid_correct
Traceback (most recent call last):
  File "/yaml/bin/py-pyyaml-py", line 36, in <module>
    for doc in yaml.load_all(sys.stdin.read(), Loader=yaml.FullLoader):
  File "/python/lib/python3.7/site-packages/yaml/__init__.py", line 130, in load_all
    yield loader.get_data()
  File "/python/lib/python3.7/site-packages/yaml/constructor.py", line 45, in get_data
    return self.construct_document(self.get_node())
  File "/python/lib/python3.7/site-packages/yaml/composer.py", line 27, in get_node
    return self.compose_document()
  File "/python/lib/python3.7/site-packages/yaml/composer.py", line 55, in compose_document
    node = self.compose_node(None, None)
  File "/python/lib/python3.7/site-packages/yaml/composer.py", line 64, in compose_node
    if self.check_event(AliasEvent):
  File "/python/lib/python3.7/site-packages/yaml/parser.py", line 98, in check_event
    self.current_event = self.state()
  File "/python/lib/python3.7/site-packages/yaml/parser.py", line 210, in parse_document_content
    DocumentStartToken, DocumentEndToken, StreamEndToken):
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 116, in check_token
    self.fetch_more_tokens()
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 251, in fetch_more_tokens
    return self.fetch_double()
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 655, in fetch_double
    self.fetch_flow_scalar(style='"')
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 666, in fetch_flow_scalar
    self.tokens.append(self.scan_flow_scalar(style))
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 1149, in scan_flow_scalar
    chunks.extend(self.scan_flow_scalar_non_spaces(double, start_mark))
  File "/python/lib/python3.7/site-packages/yaml/scanner.py", line 1224, in scan_flow_scalar_non_spaces
    "found unknown escape character %r" % ch, self.get_mark())
yaml.scanner.ScannerError: while scanning a double-quoted scalar
  in "<unicode string>", line 2, column 1:
    "\."
    ^
found unknown escape character '.'
  in "<unicode string>", line 2, column 3:
    "\."
      ^

py-ruamel-event

 invalid_correct
Traceback (most recent call last):
  File "/yaml/bin/py-ruamel-event", line 7, in <module>
    for event in ruamel.yaml.parse(sys.stdin.read()):
  File "/python/lib/python3.7/site-packages/ruamel/yaml/main.py", line 907, in parse
    while loader._parser.check_event():
  File "/python/lib/python3.7/site-packages/ruamel/yaml/parser.py", line 140, in check_event
    self.current_event = self.state()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/parser.py", line 261, in parse_document_content
    DirectiveToken, DocumentStartToken, DocumentEndToken, StreamEndToken
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 170, in check_token
    self.fetch_more_tokens()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 311, in fetch_more_tokens
    return self.fetch_double()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 729, in fetch_double
    self.fetch_flow_scalar(style='"')
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 738, in fetch_flow_scalar
    self.tokens.append(self.scan_flow_scalar(style))
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 1380, in scan_flow_scalar
    chunks.extend(self.scan_flow_scalar_non_spaces(double, start_mark))
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 1460, in scan_flow_scalar_non_spaces
    self.reader.get_mark(),
ruamel.yaml.scanner.ScannerError: while scanning a double-quoted scalar
  in "<unicode string>", line 2, column 1:
    "\."
    ^ (line: 2)
found unknown escape character '.'
  in "<unicode string>", line 2, column 3:
    "\."
      ^ (line: 2)
+STR
+DOC ---

py-ruamel-json

 invalid_correct
Traceback (most recent call last):
  File "/yaml/bin/py-ruamel-json", line 19, in <module>
    for doc in ruamel.yaml.load_all(sys.stdin.read(), Loader=ruamel.yaml.Loader):
  File "/python/lib/python3.7/site-packages/ruamel/yaml/main.py", line 976, in load_all
    yield loader._constructor.get_data()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/constructor.py", line 106, in get_data
    return self.construct_document(self.composer.get_node())
  File "/python/lib/python3.7/site-packages/ruamel/yaml/composer.py", line 68, in get_node
    return self.compose_document()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/composer.py", line 101, in compose_document
    node = self.compose_node(None, None)
  File "/python/lib/python3.7/site-packages/ruamel/yaml/composer.py", line 111, in compose_node
    if self.parser.check_event(AliasEvent):
  File "/python/lib/python3.7/site-packages/ruamel/yaml/parser.py", line 140, in check_event
    self.current_event = self.state()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/parser.py", line 261, in parse_document_content
    DirectiveToken, DocumentStartToken, DocumentEndToken, StreamEndToken
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 170, in check_token
    self.fetch_more_tokens()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 311, in fetch_more_tokens
    return self.fetch_double()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 729, in fetch_double
    self.fetch_flow_scalar(style='"')
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 738, in fetch_flow_scalar
    self.tokens.append(self.scan_flow_scalar(style))
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 1380, in scan_flow_scalar
    chunks.extend(self.scan_flow_scalar_non_spaces(double, start_mark))
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 1460, in scan_flow_scalar_non_spaces
    self.reader.get_mark(),
ruamel.yaml.scanner.ScannerError: while scanning a double-quoted scalar
  in "<unicode string>", line 2, column 1:
    "\."
    ^ (line: 2)
found unknown escape character '.'
  in "<unicode string>", line 2, column 3:
    "\."
      ^ (line: 2)

py-ruamel-py

 invalid_correct
Traceback (most recent call last):
  File "/yaml/bin/py-ruamel-py", line 36, in <module>
    for doc in ruamel.yaml.load_all(sys.stdin.read(), Loader=ruamel.yaml.Loader):
  File "/python/lib/python3.7/site-packages/ruamel/yaml/main.py", line 976, in load_all
    yield loader._constructor.get_data()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/constructor.py", line 106, in get_data
    return self.construct_document(self.composer.get_node())
  File "/python/lib/python3.7/site-packages/ruamel/yaml/composer.py", line 68, in get_node
    return self.compose_document()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/composer.py", line 101, in compose_document
    node = self.compose_node(None, None)
  File "/python/lib/python3.7/site-packages/ruamel/yaml/composer.py", line 111, in compose_node
    if self.parser.check_event(AliasEvent):
  File "/python/lib/python3.7/site-packages/ruamel/yaml/parser.py", line 140, in check_event
    self.current_event = self.state()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/parser.py", line 261, in parse_document_content
    DirectiveToken, DocumentStartToken, DocumentEndToken, StreamEndToken
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 170, in check_token
    self.fetch_more_tokens()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 311, in fetch_more_tokens
    return self.fetch_double()
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 729, in fetch_double
    self.fetch_flow_scalar(style='"')
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 738, in fetch_flow_scalar
    self.tokens.append(self.scan_flow_scalar(style))
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 1380, in scan_flow_scalar
    chunks.extend(self.scan_flow_scalar_non_spaces(double, start_mark))
  File "/python/lib/python3.7/site-packages/ruamel/yaml/scanner.py", line 1460, in scan_flow_scalar_non_spaces
    self.reader.get_mark(),
ruamel.yaml.scanner.ScannerError: while scanning a double-quoted scalar
  in "<unicode string>", line 2, column 1:
    "\."
    ^ (line: 2)
found unknown escape character '.'
  in "<unicode string>", line 2, column 3:
    "\."
      ^ (line: 2)

ruby-psych-json

 invalid_correct
/usr/lib/ruby/2.5.0/psych.rb:405:in `parse': (<unknown>): found unknown escape character while parsing a quoted scalar at line 2 column 1 (Psych::SyntaxError)
	from /usr/lib/ruby/2.5.0/psych.rb:405:in `parse_stream'
	from /usr/lib/ruby/2.5.0/psych.rb:488:in `load_stream'
	from /yaml/bin/ruby-psych-json:6:in `<main>'