Parsing structures that are in the middle of a sentence- INFO request

I am wondering how to parse the structures that are in the middle of a sentence.

Consider this example.

"Please join me on Fifteenth of May 2017 at three PM for a cup of coffee."

Here, I have the lark grammar to parse date -> "Fifteenth of May 2017 at three PM" Where the structure needs to parse is inside a sentence.
Is it possible to create a rule that can search for a pattern and parse it ?

[arunespku]

from lark import Lark

grammar = """
    status : /.*/ starter /.*/
    starter: STARTER? [date]
    STARTER: /(?:[a-zA-Z'-]+[^a-zA-Z'-]+){1,20}/

     date: [relative][number] [bet][dayes] [part] [month] [year] [hour]
     number: NUMBER [dayes] 
     part: PART
     month: [bet] MONTH [number] [bet] [MONTH]
     relative: RELATIVE
     year: YEAR
     hour: [number] [relative] HOUR
     HOUR:"hours"|"hrs"|"hour"
     dayes:  [PART][NUMBER][RELATIVE]DAYES [bet] [DAYES] [NUMBER] [PART][MONTH] [NUMBER] [partday]
     partday: [relative]PARTDAY
     bet:BET
     BET: "between"|"to"
     DAYES:"day"|"monday"|"tuesday"|"wednesday"|"saturday"|"sunday"|"friday"|"thursday"|"today"|"tommorrow"
     NUMBER:"first"|"second"|"third"|"fourth"|"fifth"|"seventh"|" twentith"
     |"eighth"|"one"|"two"|"three"|"four"|"five"
     PART: "of"|"in"|"at"
     MONTH: "January"|"February"|"March"|"April"|"May"|"June"|"July"|"August"|"Spetember"|"October"|"November"|"December"
     RELATIVE: "before"|"after" |"every"|"from"|"begining"|"end"|"by"
     YEAR: "two thousand eight"|"two thousand nine"|"two thousand seventeen"|"two thousand eighteen"|"two thousand ninteen"
     PARTDAY: "morning"|"evening"|"afternoon"|"midnight"
     
       
  
   %import common.WS
   %import common.ESCAPED_STRING
    %ignore WS
"""

parser = Lark(grammar, parser='earley', start ='status', lexer= 'dynamic_complete' )  in parse tree!
st = " Hello monday afternoon parse me"
tree = parser.parse(st)
print(tree)

File "parsingdemo.py", line 61, in <module>
    parser = Lark(grammar, parser='earley', start ='status', lexer= 'dynamic_complete' )  # Explicit ambiguity in parse tree!
  File "/home/../anaconda3/lib/python3.6/site-packages/lark/lark.py", line 165, in __init__
    self.parser = self._build_parser()
  File "/home/../anaconda3/lib/python3.6/site-packages/lark/lark.py", line 188, in _build_parser
    return self.parser_class(self.lexer_conf, parser_conf, options=self.options)
  File "/home/../anaconda3/lib/python3.6/site-packages/lark/parser_frontends.py", line 122, in __init__
    super(self).__init__(*args, complete_lex=True, **kw)

This leads to an error.

[erezsh]

Only works with parser="earley", lexer="dynamic_complete"