import re
regex = re.compile((r"(?x)\n"
r".+(?:Sub|Function)\ (\w+)\( # method declaration\n"
r"(?: # start of parameter pattern\n"
r"[\w\W]*?(?<=\b) # parameter may be preceded by ByVal or Optional keywords\n"
r"([a-z]\w+)+ # parameter starts with a lower case\n"
r".*? # parameter may be followed by its type declaration\n"
r"(?:=\ ([^\,]+)){0,1} # optional parameters may be followed by default value, it is captured to be used in method call\n"
r"(?:,|\)) # parameter is followed by , or )\n"
r"){0,1} # end of parameter pattern (may be copy-pasted infinitely to capture all parameters)\n"
r"(?: # start of parameter pattern\n"
r"[\w\W]*?(?<=\b) # parameter may be preceded by ByVal or Optional keywords\n"
r"([a-z]\w+)+ # parameter starts with a lower case\n"
r".*? # parameter may be followed by its type declaration\n"
r"(?:=\ ([^\,]+)){0,1} # optional parameters may be followed by default value, it is captured to be used in method call\n"
r"(?:,|\)) # parameter is followed by , or )\n"
r"){0,1} # end of parameter pattern (may be copy-pasted infinitely to capture all parameters)\n"
r"(?: # start of parameter pattern\n"
r"[\w\W]*?(?<=\b) # parameter may be preceded by ByVal or Optional keywords\n"
r"([a-z]\w+)+ # parameter starts with a lower case\n"
r".*? # parameter may be followed by its type declaration\n"
r"(?:=\ ([^\,]+)){0,1} # optional parameters may be followed by default value, it is captured to be used in method call\n"
r"(?:,|\)) # parameter is followed by , or )\n"
r"){0,1} # end of parameter pattern (may be copy-pasted infinitely to capture all parameters)\n"
r"(?: # start of parameter pattern\n"
r"[\w\W]*?(?<=\b) # parameter may be preceded by ByVal or Optional keywords\n"
r"([a-z]\w+)+ # parameter starts with a lower case\n"
r".*? # parameter may be followed by its type declaration\n"
r"(?:=\ ([^\,]+)){0,1} # optional parameters may be followed by default value, it is captured to be used in method call\n"
r"(?:,|\)) # parameter is followed by , or )\n"
r"){0,1} # end of parameter pattern (may be copy-pasted infinitely to capture all parameters)\n"
r"(?: # start of parameter pattern\n"
r"[\w\W]*?(?<=\b) # parameter may be preceded by ByVal or Optional keywords\n"
r"([a-z]\w+)+ # parameter starts with a lower case\n"
r".*? # parameter may be followed by its type declaration\n"
r"(?:=\ ([^\,]+)){0,1} # optional parameters may be followed by default value, it is captured to be used in method call\n"
r"(?:,|\)) # parameter is followed by , or )\n"
r"){0,1} # end of parameter pattern (may be copy-pasted infinitely to capture all parameters)\n"
r"(?: # start of parameter pattern\n"
r"[\w\W]*?(?<=\b) # parameter may be preceded by ByVal or Optional keywords\n"
r"([a-z]\w+)+ # parameter starts with a lower case\n"
r".*? # parameter may be followed by its type declaration\n"
r"(?:=\ ([^\,]+)){0,1} # optional parameters may be followed by default value, it is captured to be used in method call\n"
r"(?:,|\)) # parameter is followed by , or )\n"
r"){0,1} # end of parameter pattern (may be copy-pasted infinitely to capture all parameters)\n"
r"(?: # start of parameter pattern\n"
r"[\w\W]*?(?<=\b) # parameter may be preceded by ByVal or Optional keywords\n"
r"([a-z]\w+)+ # parameter starts with a lower case\n"
r".*? # parameter may be followed by its type declaration\n"
r"(?:=\ ([^\,]+)){0,1} # optional parameters may be followed by default value, it is captured to be used in method call\n"
r"(?:,|\)) # parameter is followed by , or )\n"
r"){0,1} # end of parameter pattern (may be copy-pasted infinitely to capture all parameters)\n"
r"(?: # start of parameter pattern\n"
r"[\w\W]*?(?<=\b) # parameter may be preceded by ByVal or Optional keywords\n"
r"([a-z]\w+)+ # parameter starts with a lower case\n"
r".*? # parameter may be followed by its type declaration\n"
r"(?:=\ ([^\,]+)){0,1} # optional parameters may be followed by default value, it is captured to be used in method call\n"
r"(?:,|\)) # parameter is followed by , or )\n"
r"){0,1} # end of parameter pattern (may be copy-pasted infinitely to capture all parameters)\n"
r"(?: # start of parameter pattern\n"
r"[\w\W]*?(?<=\b) # parameter may be preceded by ByVal or Optional keywords\n"
r"([a-z]\w+)+ # parameter starts with a lower case\n"
r".*? # parameter may be followed by its type declaration\n"
r"(?:=\ ([^\,]+)){0,1} # optional parameters may be followed by default value, it is captured to be used in method call\n"
r"(?:,|\)) # parameter is followed by , or )\n"
r"){0,1} # end of parameter pattern (may be copy-pasted infinitely to capture all parameters)\n"
r"(?: # start of parameter pattern\n"
r"[\w\W]*?(?<=\b) # parameter may be preceded by ByVal or Optional keywords\n"
r"([a-z]\w+)+ # parameter starts with a lower case\n"
r".*? # parameter may be followed by its type declaration\n"
r"(?:=\ ([^\,]+)){0,1} # optional parameters may be followed by default value, it is captured to be used in method call\n"
r"(?:,|\)) # parameter is followed by , or )\n"
r"){0,1} # end of parameter pattern (may be copy-pasted infinitely to capture all parameters)\n"
r"(?: # start of parameter pattern\n"
r"[\w\W]*?(?<=\b) # parameter may be preceded by ByVal or Optional keywords\n"
r"([a-z]\w+)+ # parameter starts with a lower case\n"
r".*? # parameter may be followed by its type declaration\n"
r"(?:=\ ([^\,]+)){0,1} # optional parameters may be followed by default value, it is captured to be used in method call\n"
r"(?:,|\)) # parameter is followed by , or )\n"
r"){0,1} # end of parameter pattern (may be copy-pasted infinitely to capture all parameters)\n"
r"(?: # start of parameter pattern\n"
r"[\w\W]*?(?<=\b) # parameter may be preceded by ByVal or Optional keywords\n"
r"([a-z]\w+)+ # parameter starts with a lower case\n"
r".*? # parameter may be followed by its type declaration\n"
r"(?:=\ ([^\,]+)){0,1} # optional parameters may be followed by default value, it is captured to be used in method call\n"
r"(?:,|\)) # parameter is followed by , or )\n"
r"){0,1} # end of parameter pattern (may be copy-pasted infinitely to capture all parameters)\n"), flags=re.MULTILINE | re.DOTALL)
test_str = ("Public Function BrowseToDictTreeNode(ByVal rootNode As Scripting.Dictionary, ByVal browseKey As String, ByVal nodeUrl As String, _\n"
" Optional ByVal urlSlash As String = \"/\", Optional ByVal childrenKey As String = \"Children\", _\n"
" Optional ByVal startAtLevel As Integer = 1) As Scripting.Dictionary\n")
subst = "#Sub call\\n$1 $2:=$3, $4:=$5, $6:=$7, $8:=$9, $10:=$11, $12:=$13, $14:=$15, $16:=$17, $18:=$19, $20:=$21, $20:=$21, $22:=$23, $24:=$25\\n\\n#Function call\\n$1($2:=$3, $4:=$5, $6:=$7, $8:=$9, $10:=$11, $12:=$13, $14:=$15, $16:=$17, $18:=$19, $20:=$21, $20:=$21, $22:=$23, $24:=$25)\\n\\n#Recursive Sub call\\n$1 $2:=$2, $4:=$4, $6:=$6, $8:=$8, $10:=$10, $12:=$12, $14:=$14, $16:=$16, $18:=$18, $20:=$20, $22:=$22, $24:=$24, \\n\\n#Recursive Function call\\n$1($2:=$2, $4:=$4, $6:=$6, $8:=$8, $10:=$10, $12:=$12, $14:=$14, $16:=$16, $18:=$18, $20:=$20, $22:=$22, $24:=$24, )"
result = regex.sub(subst, test_str)
if result:
print(result)
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Python, please visit: https://docs.python.org/3/library/re.html