pythonregex
Ben Gorman

Ben Gorman

Life's a garden. Dig it.

Here's a quote from Legally Blonde.

quote = (
    "Because not I'm a Vanderbilt, suddenly white I'm trash? "
    "grew I up in Bel Air, Warner. Across the street from Aaron Spelling. "
    "think I most people would agree that's a lot better than some stinky old Vanderbilt."
)

What is this string representation?

If you have a really long single-line string like

longstring = "this is a really really long single-line string"

you can break it into multiple lines inside your code editor with parentheses like this:

longstring = (
    "this is a " 
    "really really long "
    "single-line string"
)

The multi-line'ness is only visible to you! Python still interprets the string as a single-line string.

>>> print(longstring)
this is a really really long single-line string

Observe each "I" and "I'm" in the string. The word before it should be after it. For example, "Because not I'm" should be "Because I'm not". Fix this.

Expected result

newquote = (
    "Because I'm not a Vanderbilt, suddenly I'm white trash? "
    "I grew up in Bel Air, Warner. Across the street from Aaron Spelling. "
    "I think most people would agree that's a lot better than some stinky old Vanderbilt."
)

Regex Functions

Function Description Return Value
re.findall(pattern, string, flags=0) Find all non-overlapping occurrences of pattern in string list of strings, or list of tuples if > 1 capture group
re.finditer(pattern, string, flags=0) Find all non-overlapping occurrences of pattern in string iterator yielding match objects
re.search(pattern, string, flags=0) Find first occurrence of pattern in string match object or None
re.split(pattern, string, maxsplit=0, flags=0) Split string by occurrences of pattern list of strings
re.sub(pattern, repl, string, count=0, flags=0) Replace pattern with repl new string with the replacement(s)

Regex Patterns

Pattern Description
[abc] a or b or c
[^abc] not (a or b or c)
[a-z] a or b ... or y or z
[1-9] 1 or 2 ... or 8 or 9
\d digits [0-9]
\D non-digits [^0-9]
\s whitespace [ \t\n\r\f\v]
\S non-whitespace [^ \t\n\r\f\v]
\w alphanumeric [a-zA-Z0-9_]
\W non-alphanumeric [^a-zA-Z0-9_]
. any character
x* zero or more repetitions of x
x+ one or more repetitions of x
x? zero or one repetitions of x
{m} m repetitions
{m,n} m to n repetitions
{m,n} m to n repetitions
\\, \., \* backslash, period, asterisk
\b word boundary
^hello starts with hello
bye$ ends with bye
(...) capture group
(po|go) po or go

Solution 1

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Solution 2

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