Java remove all non alphanumeric characters

Replace all non alphanumeric characters java

Solution 2: You can also use character property to detect latin character in Java: will match any non-alphanumeric or space character that is not a latin character. Current code: Solution 1: Use explicit white list instead: Look at the similar question Solution 2: Does below work for ya? Solution 3: try this one : Question: From an input string I would like to get rid of the non-alphanumeric characters ( , , etc.) but maintain latin characters.

Replacing all non-alphanumeric characters except some characters

I want to replace all non- alphanumeric characters , but keep Æ, Ø, Å, æ, ø, å.
Current code:

Use explicit white list instead:

Look at the similar question

Regex — Java remove all non alphanumeric character from, OP said «replace ALL non alphanumeric chars in a string». It’s a negated set, so it will replace anything EXCEPT a-z, A-Z, 0-9, and any …

Removing non-alphanumerics but maintain latin characters

From an input string I would like to get rid of the non- alphanumeric character s ( : , — , etc.) but maintain latin characters . Also replace the blank spaces » » with «-» .

This is my try, but I dont know how to maintain the latin characters.

String title ="NEYÑO: HOW ARE YÓU MATE"; title = title.replaceAll("[^A-Za-z0-9 ]", "").replace(" ", "-").toLowerCase(); System.out.println(title); 

Use [^\p\s]+ with the Pattern.UNICODE_CHARACTER_CLASS option to keep all Unicode letters and digts:

String title ="NEYÑO: HOW ARE YÓU MATE"; title = title.replaceAll("(?U)[^\\p\\s]+", "").replace(" ", "-").toLowerCase(); System.out.println(title); // => neyño-how-are-yóu-mate 

• (?U) — n embedded variant of the Pattern.UNICODE_CHARACTER_CLASS option
• [^. ] — a negated character class matching any single char that does not belong to:
  • \p — any alphanumeric character
  • \s — any whitespace character

  You can also use \p character property to detect latin character in Java:

  String title ="NEYÑO: HOW ARE YÓU MATE"; title = title.replaceAll("(?!\\p)[^A-Za-z0-9 ]", "").replace(" ", "-").toLowerCase(); System.out.println(title); //=> neyño-how-are-yóu-mate 

  (?!\\p)[^A-Za-z0-9 ] will match any non-alphanumeric or space character that is not a latin character.

  Java — Removing non-alphanumerics but maintain latin, Removing non-alphanumerics but maintain latin characters. From an input string I would like to get rid of the non-alphanumeric characters (:, -, …

  API or Method to Replace all non-latin-1 characters

  I’m dealing with a 3rd party API / Web Service and they only allow latin-1 character set in their XML. Is there an existing API / method that will find and replace all non-latin-1 characters in a String?

  Is there anyway to make that Kevin?

  public String removeAccents(String text) < return Normalizer.decompose(text, false, 0) .replaceAll("\\p+", ""); > 

  I found this example at http://glaforge.appspot.com/article/how-to- remove-accents -from-a-string

  In java 1.6 the necessary normalizer might be built-in.

  I’ve come across lots of posts on how to remove all accents. This (old!) post covers my use case, so I’ll share my solution here. In my case, I only want to replace characters not present in the ISO-8859-1 charset. The use case is: read a UTF-8 file, and write it to a ISO-8859-1 file, while retaining as many of the special characters as possible (but prevent unmappable CharacterException).

  Normalizer seems interesting, but I only found ways to remove all accents.

  public static String utf8ToLatin1(final String input) < return Normalizer.normalize(input, Normalizer.Form.NFD) .replaceAll("\\p+", ""); > 

  Weirdly, the above code not only fails, but with

  CharsetEncoder seems interesting, but it appears I can only set a static » replacement» character (actually: byte array), so all unmappable characters become ‘?’ or similar

  public static String utf8ToLatin1(final String input) throws CharacterCodingException < final ByteBuffer byteBuffer = StandardCharsets.ISO_8859_1.newEncoder() .onMalformedInput(CodingErrorAction.REPLACE) .onUnmappableCharacter(CodingErrorAction.REPLACE) .replaceWith(new byte[] < (byte) '?' >) .encode(CharBuffer.wrap(input)); return new String(byteBuffer.array(), StandardCharsets.ISO_8859_1); > 

  My final solution is thus:

  public static String utf8ToLatin1(final String input) < final MapcharacterMap = new HashMap<>(); characterMap.put("ł", "l"); characterMap.put("Ł", "L"); characterMap.put("œ", "ö"); final StringBuffer resultBuffer = new StringBuffer(); final Matcher matcher = Pattern.compile("[^\\p\\p]").matcher(input); while (matcher.find()) < matcher.appendReplacement(resultBuffer, characterMap.computeIfAbsent(matcher.group(), s ->Normalizer.normalize(s, Normalizer.Form.NFD).replaceAll("\\p+", ""))); > matcher.appendTail(resultBuffer); return resultBuffer.toString(); > 

  1. The characterMap needs to be extended to your needs. The Normalizer is useful for accented characters, but you might have others. Also, extract characterMap out (beware that computeifabsent updates the map, beware of concurrency!)
  2. Pattern.compile() shouldn’t be called repeatedly, extract that out to a static

  Java — How to remove all non-alphanumeric except dot or, java regex string expression alpha. Share. Improve this question. Follow asked Oct 21, 2016 at 15:25. Julien M Julien M. 11 1 1 silver badge 3 3 …

  How to read non alphanumeric characters

  How can I read non alphanumeric characters (like Chinese characters) in Java? I tried to read a value from a .properties file but I get broken characters in output.

  filename = some method returning the file in Chinese response.setProperty("Content-disposition", "attachment; filename=\"" + fileName +"\""); response.setContentType("text/xlscharset=UTF-8"); response.setCharacterEncoding("utf-8"); 

  Not sure, how are you reading file . I would suggest you to use BufferedReader to read file , which is as follows,

  BufferedReader br = new BufferedReader(new InputStreamReader( new FileInputStream("myFilePath"),"UTF8")); 

  Above piece of code will handle Chinese characters. Now, you car use br to process your property file. If your file is UTF-16 , the replace UTF8 encoding with UTF-16 and it should do the job for you.

  Java Regex — Remove Non-Alphanumeric characters, I’m trying to remove all the non-alphanumeric characters from a String in Java but keep the I’m trying to remove all the non-alphanumeric …

  Источник

  How to Remove All Non-alphanumeric Characters From a String in Java?

  

  ‍Given: A string containing some ASCII characters.

  Task: To remove all non-alphanumeric characters in the given string and print the modified string.

  In this article, we’ll explore:

  • What are Alphanumeric and Non-alphanumeric Characters?
  • How to Remove Non-alphanumeric Characters in Java:
    Method 1: Using ASCII values
    Method 2: Using String.replace()
    Method 3: Using String.replaceAll() and Regular Expression

  What Are Alphanumeric and Non-alphanumeric Characters?

  Alpha stands for alphabets, and numeric stands for a number. So, alphabets and numbers are alphanumeric characters, and the rest are non-alphanumeric.

  Examples of alphanumeric characters: ‘a’, ‘A’, ‘p’, ‘2’

  Examples of non-alphanumeric characters: ‘!’, ‘

  Examples

  Input: Interview!@Kickstart23

  Output: InterviewKickstart23

  Here the symbols ‘!’ and ‘@’ are non-alphanumeric, so we removed them.

  Input: Interview_start

  Output: InterviewKickstart

  Here the symbols ‘_’, ‘’ and ‘@’ are non-alphanumeric, so we removed them.

  Input: InterviewKickstart23

  Output: InterviewKickstart23

  Here, there’s no need to remove any characters because all of them are alphanumeric.

  How to Remove Non-alphanumeric Characters in Java?

  To remove non-alphanumeric characters in a given string in Java, we have three methods; let’s see them one by one.

  Method 1: Using ASCII values
  

  If we see the ASCII table, characters from ‘a’ to ‘z’ lie in the range 65 to 90. Characters from ‘A’ to ‘Z’ lie in the range 97 to 122, and digits from ‘0’ to ‘9’ lie in the range 48 to 57.

  Thus, we can differentiate between alphanumeric and non-alphanumeric characters by their ASCII values.

  In this method, we’ll make an empty string object, traverse our input string and fetch the ASCII value of each character. If the ASCII value is in the above ranges, we append that character to our empty string. Else, we move to the next character.

  After iterating over the string, we update our string to the new string we created earlier.

  Java program to remove non-alphanumeric characters with

  Method 1: Using ASCII values

  // Function to remove the non-alphanumeric characters and print the resultant string

  public static String rmvNonalphnum(String s)

  // get the ascii value of current character

  // check if the ascii value in our ranges of alphanumeric and if yes then print the character

  public static void main(String args[])

  String s1 = «Interview!@Kickstart23»;

  String s2 = «Interview_start»;

  String s3 = «InterviewKickstart23»;

  Method 2: Using String.replace()

  In this approach, we use the replace() method in the Java String class. We use this method to replace all occurrences of a particular character with some new character.

  About String.replace()

  public String replace(char a, char b)

  a: old character that we need to replace.

  b: new character which needs to replace the old character.

  Resultant string after replacements.

  In this approach, we loop over the string and find whether the current character is non-alphanumeric or not using its ASCII value (as we have already done in the last method). If it is non-alphanumeric, we replace all its occurrences with empty characters using the String.replace() method.

  Java program to remove non-alphanumeric characters with

  Method 2: Using String.replace()

  // Function to remove the non-alphanumeric characters and print the resultant string

  public static String rmvNonalphnum(String s)

  // get the ascii value of current character

  // check if the current character is non-alphanumeric if yes then replace it’s all occurrences with empty char (‘\0’)

  // returning the resultant string

  public static void main(String args[])

  String s1 = «Interview!@Kickstart23»;

  String s2 = «Interview_start»;

  String s3 = «InterviewKickstart23»;

  Method 3: Using String.replaceAll() and Regular Expression

  In this approach, we use the replaceAll() method in the Java String class. This method returns the string after replacing each substring that matches a given regular expression with a given replace string.

  About String.replaceAll()

  public String replaceAll(String rgx, String replaceStr)

  replaceStr: the string which would replace the found expression.

  rgx: the regular expression that this string needs to match.

  Resultant string after replacements.

  So, we use this method to replace the non-alphanumeric characters with an empty string.

  • Our regular expression will be: [^a-zA-Z0-9]. This means, “only consider pattern substring with characters ranging from ‘a’ to ‘z’, ‘A’ to ‘Z’ and ‘0’ to ‘9’.”
  • Replacement String will be: «» (empty string)
  • Here ^ Matches the beginning of the input: It means, “replace all substrings with pattern [^a-zA-Z0-9] with the empty string.”

  Java program to remove non-alphanumeric characters with

  Method 2: Using String.replace()

  // Function to remove the non-alphanumeric characters and print the resultant string

  public static void rmvNonalphnum(String s)

  // replacing all substring patterns of non-alphanumeric characters with empty string

  public static void main(String args[])

  String s1 = «Interview!@Kickstart23»;

  String s2 = «Interview_start»;

  String s3 = «InterviewKickstart23»;

  Are You Ready to Nail Your Next Coding Interview?

  Whether you’re a Coding Engineer gunning for Software Developer or Software Engineer roles, or you’re targeting management positions at top companies, IK offers courses specifically designed for your needs to help you with your technical interview preparation!

  If you’re looking for guidance and help with getting started, sign up for our free webinar. As pioneers in the field of technical interview prep, we have trained thousands of Software Engineers to crack the most challenging coding interviews and land jobs at their dream companies, such as Google, Facebook, Apple, Netflix, Amazon, and more!

  Article contributed by Omkar Deshmukh

  Источник