Find all upper,lower combinations of string in Python

Question

I want to search a string in each line of a list, it will match every case of UP/LOW combination possible

For example: If i type in "all" and it will search "all" "All "ALL" "aLL" "aLl" ... etc. It works like advanced search in text document i think.

More detail : if 'all' was input, then any of these strings appear in that line will return FOUNDED : 'all', 'alL', 'All', 'ALL', 'aLL', 'aLl', 'AlL', 'ALl'

Here is how i done with correct string find

string = "all"
line[i].find(string)

if the line was "ALL" , the result was not found, so this is a limitation.

can you just lowercase `line[i]`? and see if `all` is there? — depperm, Apr 18 '17 at 13:45
Possible duplicate of [Case insensitive Python regular expression without re.compile](http://stackoverflow.com/questions/500864/case-insensitive-python-regular-expression-without-re-compile) — Peter Wood, Apr 18 '17 at 13:47
@depperm Yes it'd be done but I must keep the integrity of data so anyway else — Federal Reserve, Apr 18 '17 at 13:50
you could create a copy and lowercase the copy and check.... — depperm, Apr 18 '17 at 13:56
You can convert the line and the search to the same case: `line[i].lower().find(string.lower())`. It doesn't change the original strings as they are immutable. — Peter Wood, Apr 18 '17 at 14:03
Does this answer your question? [How to generate all combinations of lower and upper characters in a word?](https://stackoverflow.com/questions/50775110/how-to-generate-all-combinations-of-lower-and-upper-characters-in-a-word) — iacob, Mar 11 '21 at 15:29

score 2 · Answer 1 · edited Apr 18 '17 at 18:14

2

>>> lines = ['All', 'ALL', 'all', 'WALL', 'BLAA', 'Balls']
>>> for line in lines:
...     if 'all' in line.lower():
...         print(line)


All
ALL
all
WALL
Balls

edited Apr 18 '17 at 18:14

Al Sweigart

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answered Apr 18 '17 at 13:46

A.N.

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who downvoted and why? while not necessarily the best solution this is a valid solution – depperm Apr 18 '17 at 13:48
Of course, you can use comprehension: ```print([l for l in line if 'all' in l.lower()])``` – A.N. Apr 18 '17 at 13:49
3

@depperm I didn't downvote, but code only answers are discouraged and also searching for a duplicate might have been better – Chris_Rands Apr 18 '17 at 13:50
But it's a simple solution in the code and nothing extra. – A.N. Apr 18 '17 at 13:52
so it will only find the lower case, i want to search in UPPER case too, like i type in "all", the line was "ALL" but result is "1 line found" or return index – Federal Reserve Apr 18 '17 at 14:02
It finds the uppercased strings as well @FederalReserve – Mr. Xcoder Apr 18 '17 at 14:04

score 1 · Answer 2 · answered Apr 18 '17 at 13:52

1

Try with list comprehension,

In [25]: line = ['All', 'ALL', 'all', 'WALL', 'BLAA', 'Balls']

In [26]: [i for i in line if 'all' in i.lower() ]
Out[26]: ['All', 'ALL', 'all', 'WALL', 'Balls']

answered Apr 18 '17 at 13:52

Rahul K P

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score 1 · Accepted Answer · answered Apr 18 '17 at 14:07

1

There are a few ways of achieving that. Here they are:

1. Changing the case of the string you are searching into:

line[i].lower().find(string.lower())

or

line[i].upper().find(string.upper())

Here we're abusing of the immutability of the original strings, since they won't be changed although we apply .upper() to them, since we're not doing any assignment.

2. using the re module would also be helpful:

import re
re.search('all', line[0], re.IGNORECASE)

or

re.search('(?i)all',line[0])

answered Apr 18 '17 at 14:07

Mr. Xcoder

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Thanks, the IGNORCASE is what i'm looking for. – Federal Reserve Apr 18 '17 at 14:11
You're welcome! Please ask any other questions about this if something is still unclear – Mr. Xcoder Apr 18 '17 at 14:13

Find all upper,lower combinations of string in Python

3 Answers3