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Python Regular Expression - Only allow upper and lower characters


Python Regular Expression - Only allow upper and lower characters

By : Stiglic
Date : November 21 2020, 09:01 AM
Does that help According to the Python RegEx docs, \b "Matches the empty string, but only at the beginning or end of a word", which is not what you want. This will match "Ollie@" because "@" is "after the end of the word", and \b matches the empty string between "e" and "@".
Try r"[a-zA-Z]+$" instead.
code :


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Using a regular expression to find words with lower and upper case characters in parenthesis

Using a regular expression to find words with lower and upper case characters in parenthesis


By : user3625060
Date : March 29 2020, 07:55 AM
This might help you I'm creating a program that searches a string for finding words that are in parenthesis with lower and upper case characters but I can't seem to figure out what regular expression to use. Example word - (LowerUpper) , try this one
code :
\(([A-Z]+[a-z]+)[A-za-z]*\)|\(([a-z]+[A-Z]+[A-za-z]*)\)
Regular expression to validate a string for at least n number of Upper case, Lower case , number and special characters

Regular expression to validate a string for at least n number of Upper case, Lower case , number and special characters


By : user5413372
Date : March 29 2020, 07:55 AM
I hope this helps . You will need to construct a regular expression using the constructor since n is variable. Here is an example:
Constructed regex with n = 2:
code :
var n = 2;
var constructedRegEx = "^(?=(?:.*[0-9]){" + n + ",})(?=(?:.*[a-z]){" + n + ",})(?=(?:.*[A-Z]){" + n + ",})(?=(?:.*[[!@#$%^&*()_+]){" + n + ",}).+$";

var PasswordRegEx = new RegExp(constructedRegEx, 'm');

console.log(PasswordRegEx.test('@Al1#a2B'));
console.log(PasswordRegEx.test('@Al1#a2'));
^(?=(?:.*[0-9]){2,})(?=(?:.*[a-z]){2,})(?=(?:.*[A-Z]){2,})(?=(?:.*[!@#$%^&*]){2,}).+$
    NODE                     EXPLANATION
----------------------------------------------------------------------
  ^                        the beginning of a "line"
----------------------------------------------------------------------
  (?=                      look ahead to see if there is:
----------------------------------------------------------------------
    (?:                      group, but do not capture (at least 2
                             times (matching the most amount
                             possible)):
----------------------------------------------------------------------
      .*                       any character except \n (0 or more
                               times (matching the most amount
                               possible))
----------------------------------------------------------------------
      [0-9]                    any character of: '0' to '9'
----------------------------------------------------------------------
    ){2,}                    end of grouping
----------------------------------------------------------------------
  )                        end of look-ahead
----------------------------------------------------------------------
  (?=                      look ahead to see if there is:
----------------------------------------------------------------------
    (?:                      group, but do not capture (at least 2
                             times (matching the most amount
                             possible)):
----------------------------------------------------------------------
      .*                       any character except \n (0 or more
                               times (matching the most amount
                               possible))
----------------------------------------------------------------------
      [a-z]                    any character of: 'a' to 'z'
----------------------------------------------------------------------
    ){2,}                    end of grouping
----------------------------------------------------------------------
  )                        end of look-ahead
----------------------------------------------------------------------
  (?=                      look ahead to see if there is:
----------------------------------------------------------------------
    (?:                      group, but do not capture (at least 2
                             times (matching the most amount
                             possible)):
----------------------------------------------------------------------
      .*                       any character except \n (0 or more
                               times (matching the most amount
                               possible))
----------------------------------------------------------------------
      [A-Z]                    any character of: 'A' to 'Z'
----------------------------------------------------------------------
    ){2,}                    end of grouping
----------------------------------------------------------------------
  )                        end of look-ahead
----------------------------------------------------------------------
  (?=                      look ahead to see if there is:
----------------------------------------------------------------------
    (?:                      group, but do not capture (at least 2
                             times (matching the most amount
                             possible)):
----------------------------------------------------------------------
      .*                       any character except \n (0 or more
                               times (matching the most amount
                               possible))
----------------------------------------------------------------------
      [!@#0^&*]                any character of: '!', '@', '#', '0',
                               '^', '&', '*'
----------------------------------------------------------------------
    ){2,}                    end of grouping
----------------------------------------------------------------------
  )                        end of look-ahead
----------------------------------------------------------------------
  .+                       any character except \n (1 or more times
                           (matching the most amount possible))
----------------------------------------------------------------------
  $                        before an optional \n, and the end of a
                           "line"
----------------------------------------------------------------------
)                        end of grouping
----------------------------------------------------------------------
regular expression to allow alphanumerique (upper and lower) and comma delimiter

regular expression to allow alphanumerique (upper and lower) and comma delimiter


By : Pirx1990
Date : March 29 2020, 07:55 AM
wish help you to fix your issue As mentioned in my comment, you should use the i modifier, to make your regex case-insensitive.
You should also reverse your thinking process, instead of banning a lot of characters, you should allow only the characters you want :
code :
$var = $var.replace(/([^A-Z0-9,])+/gi, '');
regular expression for length 6 to 20 characters with upper and lower case alphabets and numeric character support

regular expression for length 6 to 20 characters with upper and lower case alphabets and numeric character support


By : cjm
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , this regex is used to test the password that support at least one lower case and upper case alphabets and numbers. this regex is not support 6 to 20 characters support. ,
Working Snippet
code :
var password = prompt("Enter password", "1234567890Aa1234567890");

var regex = /^(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{6,20}$/;

console.log("Password valid?: ", regex.test(password));
Regular expression to separate string containing upper and lower case

Regular expression to separate string containing upper and lower case


By : rahul
Date : March 29 2020, 07:55 AM
wish of those help Assuming that your example is representative of all possibilities, what you have is:
The gene name is always in the beginning of the string It's always in uppercase, sometimes with numbers (maybe punctuations?) There are cases when the gene name is merged with the next sentence, that always begin with uppercase, followed by lower case.
code :
library(stringr)

# Extract any characters before the first space:
fWord <- str_extract(example, '([^[:blank:]]+)')

# Find the index of strings that have lower cases:
ind <- grep('[:lower:]', fWord)

# Select everything until the first lower caseand remove the last character:
fWord[ind] <- str_sub(str_extract(fWord[ind], '([^[:lower:]]+)' ), end = -2)

> fWord
[1] "STAT1"     "PMS2DNA"   "FANCA"     "HAX1"      "ELANE"     "IL1RN"    
[7] "PRKDCT-B-" "MSH6"      "AP3B1FHL" 
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