Regular Expressions in Python

Write a Python program to check that a string contains only a certain set of characters (in this case a-z, A-Z and 0-9).

Write a Python program that matches a string that has an a followed by zero or more b's.

Write a Python program that matches a string that has an a followed by one or more b's.

Write a Python program that matches a string that has an a followed by zero or one 'b'.

Write a Python program that matches a string that has an a followed by three 'b'.

Write a Python program that matches a string that has an a followed by two to three 'b'.

Write a Python program to find sequences of lowercase letters joined by an underscore.

Write a Python program to find the sequences of one upper case letter followed by lower case letters.

Write a Python program that matches a string that has an 'a' followed by anything ending in 'b'.

Write a Python program that matches a word at the beginning of a string.

Write a Python program that matches a word at the end of a string, with optional punctuation.

Write a Python program that matches a word containing 'z'.

Write a Python program that matches a word containing 'z', not the start or end of the word.

Write a Python program to match a string that contains only upper and lowercase letters, numbers, and underscores.

Write a Python program that starts each string with a specific number.

Write a Python program to remove leading zeros from an IP address.

Write a Python program to check for a number at the end of a string.

Write a Python program to search for numbers (0-9) of length between 1 and 3 in a given string.

"Exercises number 1, 12, 13, and 345 are important"

Write a Python program to search for literal strings within a string. Sample text : "The quick brown fox jumps over the lazy dog." Searched words : "fox", "dog", "horse"

Write a Python program to search for a literal string in a string and also find the location within the original string where the pattern occurs. Sample text : "The quick brown fox jumps over the lazy dog." Searched words : "fox"

Write a Python program to find the substrings within a string.

Sample text: "Python exercises, PHP exercises, C# exercises"

Pattern: "exercises"

Note: There are two instances of exercises in the input string.

Write a Python program to find the occurrence and position of substrings within a string.

Write a Python program to replace whitespaces with an underscore and vice versa.

Write a Python program to extract year, month and date from an URL.

Write a Python program to convert a date of yyyy-mm-dd format to dd-mm-yyyy format.

Write a Python program to match if two words from a list of words start with the letter 'P'.

Write a Python program to separate and print the numbers in a given string.

Write a Python program to find all words starting with 'a' or 'e' in a given string.

Write a Python program to separate and print the numbers and their position in a given string.

Write a Python program to abbreviate "Road" as "Rd." in a given string.

Write a Python program to replace all occurrences of a space, comma, or dot with a colon.

Write a Python program to replace maximum 2 occurrences of space, comma, or dot with a colon.

Write a Python program to find all five-character words in a string.

Write a Python program to find all three, four, and five character words in a string.

Write a Python program to find all words that are at least 4 characters long in a string.

Write a Python program to convert a camel-case string to a snake-case string.

Write a Python program to convert a snake-case string to a camel-case string.

Write a Python program to extract values between quotation marks of a string.

Write a Python program to remove multiple spaces from a string.

Write a Python program to remove all whitespaces from a string.

Write a Python program to remove everything except alphanumeric characters from a string.

Write a Python program to find URLs in a string.

Write a Python program to split a string into uppercase letters.

Write a Python program to do case-insensitive string replacement.

Write a Python program to remove ANSI escape sequences from a string.

Write a Python program to find all adverbs and their positions in a given sentence. Sample text : "Clearly, he has no excuse for such behavior."

Write a Python program to split a string with multiple delimiters. Note: A delimiter is a sequence of one or more characters used to specify the boundary between separate, independent regions in plain text or other data streams. For example, the comma character acts as a field delimiter in a sequence of comma-separated values.

Write a Python program to check a decimal with a precision of 2.

Write a Python program to remove words from a string of length between 1 and a given number.

Write a Python program to remove the parenthesis area in a string. Sample data: ["example (.com)", "w3resource", "github (.com)", "stackoverflow (.com)"] Expected Output: example w3resource github stackoverflow

Write a Python program to insert spaces between words starting with capital letters.

Write a Python program that reads a given expression and evaluates it. Terms and conditions:

• The expression consists of numerical values, operators and parentheses, and ends with '='.
• The operators include +, -, *, / representing addition, subtraction, multiplication and division.
• When two operators have the same precedence, they are applied from left to right.
• You may assume that there is no division by zero.
• All calculations are performed as integers, and any decimal portion is truncated.
• The length of the expression will not exceed 100.
• Intermediate results of computation will be within the range of -1 to 10^9.

Write a Python program to remove lowercase substrings from a given string.

Write a Python program to concatenate the consecutive numbers in a given string.

Original string: "Enter at 1 20 Kearny Street. The security desk can direct you to floor 1 6. Please have your identification ready."

After concatenating the consecutive numbers: "Enter at 120 Kearny Street. The security desk can direct you to floor 16. Please have your identification ready."

Write a Python program to convert a given string to snake case.

Sample Output: java-script gd-script btw…-what--do-you-call-that-naming-style?-snake-case?

Write a Python program that takes any number of iterable objects or objects with a length property and returns the longest one.

Sample Output: Orange [1, 2, 3, 4, 5] Java Python

Write a Python program that checks whether a word starts and ends with a vowel in a given string. Return true if a word matches the condition; otherwise, return false.

Sample Data: ("Red Orange White") -> True ("Red White Black") -> False ("abcd dkise eosksu") -> True

Write a Python program that takes a string with some words. For two consecutive words in the string, check whether the first word ends with a vowel and the next word begins with a vowel. If the condition is met, return true; otherwise, return false. Only one space is allowed between words.

Sample Data: ("These exercises can be used for practice.") -> True ("Following exercises should be removed for practice.") -> False ("I use these stories in my classroom.") -> True