Assignment7.ipynb

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   "source": [
    "Answer-1"
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   "source": [
    "a literal notation and a constructor.The re. compile() function returns Regex objects."
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   "source": [
    "Answer-2"
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   "source": [
    " Raw strings are used so that backslashes do not have to be escaped."
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   "source": [
    "Answer-3"
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   "source": [
    "The search() method returns Match objects."
   ]
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   "source": [
    "Answer-4"
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   "source": [
    "The group() method returns strings of the matched text."
   ]
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   "source": [
    "Answer-5"
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   "source": [
    "Group 0 is the entire match, group 1 covers the first set of parentheses, and group 2 covers the second set of parentheses."
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   "source": [
    "Answer-6"
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   "source": [
    "Periods and parentheses can be escaped with a backslash: \\., \\(, and \\)."
   ]
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   "source": [
    "Answer-7"
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   "source": [
    "if the regex has no groups, a list of strings is returned. If the regex has groups, a list of tuples of strings is returned."
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   "source": [
    "Answer-8"
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   "source": [
    " | character signifies matching \"either, or\" between two groups."
   ]
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   "source": [
    "Answer-9"
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   "source": [
    "the ? character can either mean \"match zero or one of the preceding group\" or be used to signify nongreedy matching."
   ]
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   "source": [
    "Answer-10"
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   "source": [
    "the + matches one or more. The * matches zero or more."
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   "source": [
    "Answer-11"
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   "source": [
    "the {4} matches exactly three instances of the preceding group , the {4,5} matches between three and five instances."
   ]
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   "id": "0ea50c5a",
   "metadata": {},
   "source": [
    "ANswer-12"
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   "source": [
    "the \\d, \\w, and \\s shorthand character classes match a single digit, word, or space character, respectively."
   ]
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   "id": "0aa98183",
   "metadata": {},
   "source": [
    "Answer-13"
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   "source": [
    "the \\D, \\W, and \\S shorthand character classes match a single character that is not a digit,\n",
    "word, or space character, respectively."
   ]
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   "cell_type": "markdown",
   "id": "a489dcbf",
   "metadata": {},
   "source": [
    "Answer-14"
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   "source": [
    "the . performs a greedy match, and the .? performs a nongreedy match."
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   "metadata": {},
   "source": [
    "Answer-15"
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  },
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   "cell_type": "markdown",
   "id": "4efc4c93",
   "metadata": {},
   "source": [
    "either [0-9a-z] or [a-z0-9] is the syntax"
   ]
  },
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   "metadata": {},
   "source": [
    "Answer-16"
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   "source": [
    "Passing re.I or re.IGNORECASE as the second argument to re.compile() will make the matching case insensitive."
   ]
  },
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   "cell_type": "markdown",
   "id": "68ccd965",
   "metadata": {},
   "source": [
    "Answer-17"
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   "source": [
    "the . character normally matches any character except the newline character. \n",
    "If re.DOTALL is passed as the second argument to re.compile(), then the dot will also match newline characters."
   ]
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   "cell_type": "markdown",
   "id": "138d8660",
   "metadata": {},
   "source": [
    "Answer-18"
   ]
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  {
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   "metadata": {},
   "source": [
    "'X drummers, X pipers, five rings, X hens'"
   ]
  },
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   "id": "def322a1",
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   "source": [
    "Answer-19"
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   "source": [
    "The re.VERBOSE argument allows you to add whitespace and comments to the string passed to re.compile()."
   ]
  },
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   "id": "bd406920",
   "metadata": {},
   "source": [
    "Answer-20"
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   "source": [
    "re.compile(r'^\\d{1,3}(,\\d{3})*$') #will create this regex, but other regex strings can produce a similar regular expression."
   ]
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   "source": [
    "ANswer-21"
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   "source": [
    "re.compile(r'[A-Z][a-z]*\\sWatanabe)"
   ]
  },
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   "id": "2d59e8a9",
   "metadata": {},
   "source": [
    "Answer-22"
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   "id": "48766ff7",
   "metadata": {},
   "source": [
    "re.compile(r'(Alice|Bob|Carol)\\s(eats|pets|throws)\\s(apples|cats|baseballs)\\.', re.IGNORECASE)"
   ]
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