Text includesAlphabet, Spaces and character. 2) some of special characters need to be escaped by \, e.g. will join all of the elements returned with an empty string. character range. If we want to remove that specific character, we can replace that character with an empty string. In your case, this will mean no letters in the range of a-z and numbers 0-9. To accept one or more digits, change the * to +. write regex for it as. is used to check whether characters in the string are alphanumeric. : Itll match all of the characters except the alphabets. This pattern matches: Your patterns are out of sync with the descriptions. ranges in Regular expressions. If the first character of the set is. This regex is allowing a string with only '$', please see my edit. Ultimately, Python strings are immutable, so all of the mentioned methods will remove characters from the string and return a new string. Now you will use the replace() string method and do the following actions. The square brackets [] are known as a character class. Remove all characters except alphabets from a string. Connect and share knowledge within a single location that is structured and easy to search. No letters, no characters. Right? match. In a .NET regex, you may use a character class substraction, and the pattern can be written as It wont modify the original string. [A-Z]): Match at least one uppercase letter. The same might need to be done for all characters that are used by regex I think, following pattern will work Can you figure All of the characters except the alphabets are removed. UPDATE: You mixed up the arguments to IsMatch. /^-? With an added quantifier that repeats the character class one or more times, and anchors that bind the match to the start and end of the string, were good to go. Not the answer you're looking for? .join() will join all of the elements returned with an empty string. Return the string obtained by replacing the leftmost nonoverlapping occurrences of pattern in the string by the replacement repl. 2) some of special characters need to be escaped by \, e.g. You can use the str.replace() method to achieve this. Please refer, isValid = regex.test(document.getElementById(, ="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js">

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