regex to match positive integers

create and test a regex to: match positive integer numbers

### useful: test data
good_matches = [
   "1",
   "12",
   "65324",
   "0",
]

bad_matches = [
    "blah",
    "f123",
    "245fsd"
    "4-5",
    "4.0"
    "-10"
]

import re

regex = r"\b[0-9]+\b"
for test in good_matches:
    if not re.fullmatch(regex, test):
        print("failed:", test)

for test in bad_matches:
    if re.fullmatch(regex, test):
        print("failed:", test)

print(regex)

\b[0-9]+\b

regex for positive or negative integers

create and test a regex to: match positive or negative integers

### useful: test data
good_matches = [
   "1",
   "12",
   "65324",
   "+19",
   "-10",
   "0"
]

bad_matches = [
   "-0",
   "+0",
   "blah",
   "f123",
   "123you",
   "4-5",
   "4.0"
]

regex = r"([+\-]?[1-9][0-9]*)|0"
for test in good_matches:
    if not re.fullmatch(regex, test):
        print("failed:", test)

for test in bad_matches:
    if re.fullmatch(regex, test):
        print("failed:", test)

print(regex)

([+\-]?[1-9][0-9]*)|0

decimal numbers `*`

create and test a regex to: match decimal numbers

### useful: test data
good_matches = [
       "1",
       "12",
       "123.4554",
       "0.43",
       "-10",
       "0",
       "+2.3",
       "-2.3"
   ]
   
bad_matches = [
   "-0",
   "+0",
   "blah",
   "f123",
   "123you",
   "4-5",
   "..34",
   ".34",
   "0.",
   "234."
]      

regex = r"([+-]?[0-9]+\.[0-9]+)|([+\-]?[1-9][0-9]*)|0"

for test in good_matches:
    if not re.fullmatch(regex, test):
        print("failed:", test)

for test in bad_matches:
    if re.fullmatch(regex, test):
        print("failed:", test)

print(regex)

([+-]?[0-9]+\.[0-9]+)|([+\-]?[1-9][0-9]*)|0

verbs

create and test a regex to: find words that look like verbs and end in ‘-ing’

### useful: test data
good_matches = [
   "jumping",
   "eating",
   'sleeping',
   'ting',
   'bing',
   'zipziplinging'
]

bad_matches = [
   'jump',
   'ing',
   'jump ing',
   '_ing',
   '234ing'
]         

regex = r"[a-zA-Z]+ing"

for test in good_matches:
    if not re.fullmatch(regex, test):
        print("failed:", test)

for test in bad_matches:
    if re.fullmatch(regex, test):
        print("failed:", test)

print(regex)

[a-zA-Z]+ing

cats are awesome

create and test a regex to match: lines that start with the word ‘cats’ and end with the words ‘are awesome’

### useful: test data
good_matches = [
   "cats are awesome",
   "cats that sleep are awesome",
   'cats that can count to 10 are awesome',
   'cats 1234567890-/.,gdf/.g, are awesome',
]

bad_matches = [
   'cat'
   'awesome',
   'cats are',
   'cats are awesome too',
   'my cats are awesome',
]

regex = r'cats.*are awesome'

for test in good_matches:
    if not re.fullmatch(regex, test):
        print("failed:", test)

for test in bad_matches:
    if re.fullmatch(regex, test):
        print("failed:", test)

print(regex)

cats.*are awesome

TODO

TODO: excersizes for iterall and match groups