Regular Expression Replace ChallengeIn this challenge you will use the file regex_replace_challenge_student. py to:Write a regular expression that will replace all occurrences of:regular-expressionregular:expres sion regular&expressionIn the string: This is a string to search for a regular expression like regular expression or regular-expression orregular:expression or regular&expressionAssign the regular expression to a variable named patternUsing the sub() method from the re package substitute all occurrences of the 'pattern' with 'substitution'Assign the outcome of the sub() method to a variable called replace_resultOutput to the console replace_resultsRegular Expression Replace ChallengeThe Python statement containing the string to search for the regular expression occurrence is below. search_string=’’’This is a string to search for a regular expression like regular expression or regular-expression or regular:expression or regular&expression’’’Write a regular expression that will find all occurrences of:a. regular expressionb. regular-expressionc. regular:expressiond. regular&expression in search_string

a  social news website  is an  internet  website  that features  user-posted stories. such stories are ranked based on popularity, as voted on by other users of the site or by website administrators. users typically comment online on the news posts and these comments may also be ranked in popularity. since their emergence with the birth of  web 2.0, social news sites have been used to link many types of information, including news, humor, support, and discussion. all such websites allow the users to submit content and each site differs in how the content is moderated. on the  slashdot  and  fark  websites,  administrators  decide which articles are selected for the front page. on  reddit  and  digg, the articles that get the most votes from the community of users will make it to the front page. many social news websites also feature an online comment system, where users discuss the issues raised in an article. some of these sites have also applied their voting system to the comments, so that the most popular comments are displayed first. some social news websites also have a  social networking  function, in that users can set up a user profile and follow other users' online activity on the website.