Python : ChatBot(using Regular Expression )

Simple Chatbot

EchoBot_01

EchoBot_02

EchoBot_03: using functions

EchoBot_04: using class


Google Search Bot

ChatBot_01

ChatBot_02

ChatBot_03

Regular Expression.

A RegEx, or Regular Expression, is a sequence of characters that forms a search pattern. RegEx can be used to check if a string contains the specified search pattern.

Let's make a more flexible chatbot using Re.

import re
m = re.search("[a-zA-Z0-9]", "0")

Regular expression 1

import re
matched = re.search("[a-zA-Z|_][a-zA-Z0-9_]*", "data")
if matched: 
    print(matched.group())

Regular expression 2

print(re.search(r"\d\d\d","119"))

Regular expression 3

m = re.search(r"([a-zA-Z|_][a-zA-Z0-9]*):(\d+)-(\d+)-(\d+)", 
              "jung:010-1234-5678")

Regular expression 4: Grouping

Let's use all four matching functions from now on.
- search()
- match()
- findall()
- finditer()

Regular expression 5: 4 matching functions

import re
p = re.compile(r"(\d+)|([a-zA-z][\w]*)")
result = p.findall("int main() { int i = 10; for(i=1; i<10; i++)" )
print(result)

Regular expression 6: examples

Python_8장_RE_07_Chatbot_1: https://colab.research.google.com/drive/124-Nkv46whz7eLXsxsT8frzgOFctj0Au

Python_8장_RE_07_Chatbot_2: https://colab.research.google.com/drive/1MmWzmPnmfdVnRU4QOIY43gaZ7i3Qt9cq

WebCrawling

Python_8장_RE_08_WebCrawling_01: https://colab.research.google.com/drive/1EvQpXRgTBymX4yzWfxPoV7fyj91IDAPQ