Normalize the English text to lowercased words and punctuation marks using regular expressions
He said, “It's time to go!”
he said, "it's time to go!"
Complete the following task based on the instruction and optional input provided.### Instruction:
Normalize the English text to lowercased words and punctuation marks using regular expressions

### Input:
He said, “It's time to go!”

### Output:
he said, "it's time to go!"