• docs.python.org – re — Regular expression operations

ค้นหาตัวอักษรระหว่าง AAA และ ZZZ

• How to extract the substring between two markers?

import re

text = 'gfgfdAAA1234ZZZuijjk'

try:
    found = re.search('AAA(.+?)ZZZ', text).group(1)
except AttributeError:
    # AAA, ZZZ not found in the original string
    found = '' # apply your error handling
print (found)
# found: 1234

import re

text = 'page-0188482009-20211001-0002.json'

try:
    found = re.search('page-\w+-(.+?)-', text).group(1)
except AttributeError:
    found = ''
print (found)
# found: 20211001

หาชื่อไฟล์ที่อยู่หลัง folder ที่กำหนด

import re

text = 'content/ptn_year=2021/ptn_month=10/ptn_day=01/content-20211001.json'

try:
    found = re.search('ptn_day=\w+/(.*)', text).group(1)
except AttributeError:
    found = ''
print (found)
# found: content-20211001.json

• Case Styles: Camel, Pascal, Snake, and Kebab Case
• Elegant Python function to convert CamelCase to snake_case?

The most popular ways to combine words into a single string

• camelCase
• PascalCase
• snake_case
• kebab-case

Snake case to camel case

def snake_to_camel(text):
    text = ''.join(word.title() for word in text.split('_'))
    return text

st = 'user_login_count'
print(snake_to_camel(st))
# UserLoginCount

Camel case to snake case

• docs.python.org – re — Regular expression operations

import re

def camel_to_snake(text):
  return re.sub(r'(?<!^)(?=[A-Z])', '_', text).lower()

print(camel_to_snake('userLoginCount'))
print(camel_to_snake('HTTPResponseCodeXYZ'))
# user_login_count
# h_t_t_p_response_code_x_y_z

import re

def camel_to_snake(name):
    name = re.sub('(.)([A-Z][a-z]+)', r'\1_\2', name)
    return re.sub('([a-z0-9])([A-Z])', r'\1_\2', name).lower()

def to_snake_case(name):
    name = re.sub('(.)([A-Z][a-z]+)', r'\1_\2', name)
    name = re.sub('__([A-Z])', r'_\1', name)
    name = re.sub('([a-z0-9])([A-Z])', r'\1_\2', name)
    return name.lower()

print(camel_to_snake('UserLoginCount'))
print(camel_to_snake('camel2_camel2_case'))
print(camel_to_snake('getHTTPResponseCode'))
print(camel_to_snake('HTTPResponseCodeXYZ'))
# user_login_count
# camel2_camel2_case
# get_http_response_code
# http_response_code_xyz