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If you want to remove specific punctuation from a string, it will probably be best to explicitly remove exactly what you want like. Doing the above still doesn't return the string as you have specified it.
If you want to remove any extra spaces that were left over from removing crazy punctuation, then you are going to want to do something like. Removes everything except alphanumeric characters and whitespace, then collapses multiple adjacent characters to single spaces. For Unicode punctuation such as curly quotes, em-dashes, etcyou can easily match on specific block ranges. That should match pretty much any punctuation you encounter.
The search pattern can be anything from a simple character, a fixed string or a complex expression containing special characters describing the pattern. The pattern defined by the regex may match one or several times or not at all for a given string. The pattern defined by the regex is applied on the text from left to right. Once a source character has been used in a match, it cannot be reused. A simple example for a regular expression is a literal string.
For example, the Hello World regex matches the "Hello World" string. A dot matches any single character; it would match, for example, "a" or "1". The following tables lists several regular expressions and describes which pattern they would match. Matches the word "this" followed by one or more whitespace characters followed by the word "is" followed by one or more whitespace characters followed by the word "text". Matches for example "5", "1.
Regular expressions are supported by most programming languages, e. Unfortunately each language supports regular expressions slightly different. Some of the following examples use JUnit Tutorial to validate the result. You should be able to adjust them in case if you do not want to use JUnit.
The following description is an overview of available meta characters which can be used in regular expressions. This chapter is supposed to be a references for the different regex elements. When a caret appears as the first character inside square brackets, it negates the pattern. This pattern matches any character except a or b or c. The following meta characters have a pre-defined meaning and make certain common patterns easier to use.
The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I am trying to get a sentence using input from the user in Java, and i need to make it lowercase and remove all punctuation.
Here is my code:. I cant seem to find any way to remove all non-letter characters. I have tried using regexes and iterators with no luck. Thanks for any help.Hd streaming classical music
This first removes all non-letter characters, folds to lowercase, then splits the input, doing all the work in a single line:. By removing the rubbish characters before splitting, you avoid having to loop through the elements. You can use following regular expression construct. If you don't want to use RegEx which seems highly unnecessary given your problemperhaps you should try something like this:. It loops through the underlying char in the String and only appends the char if it is a letter or digit filtering out all symbols, which I am assuming is what you are trying to accomplish and then appends the lower case version of the char.
Learn more. How can I remove punctuation from input text in Java? Ask Question. Asked 6 years, 7 months ago. Active 9 months ago. Viewed k times. TheDoctor TheDoctor 1, 2 2 gold badges 11 11 silver badges 27 27 bronze badges. Active Oldest Votes.
The :space: portion of the regex makes no sense, and probably does not do what you intend. In fact, inside the character class, ,-: means "all characters with ASCII codes from 44 the comma up to 58 the colon ". A literal hyphen must be the first or the last character in a character class; otherwise, it is treated as a range like A-Z. So, if you wanted to convert all consecutive strings of junk to a single space, preserving only letters, digits, commas, slashes, hyphens, and whitespace, you could write:.
Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Remove all characters except Ask Question. Asked 3 years, 1 month ago. Active 2 years, 11 months ago. Viewed 5k times. Active Oldest Votes. Last line of answer is missing closing bracket ] 2. In this answer, each unwanted character is separately converted to a blank. Applying this answer to the test string results in an answer with multiple blanks at the end.
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The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. In Java, what is the most efficient way of removing given characters from a String? Currently, I have this code:. Would it be faster if I used some sort of StringBuilder, or a regex, or maybe something else? Yes, I know: profile it and see, but I hope someone can provide an answer of the top of their head, as this is a common task.Cmu ini course schedule
In cases like this, I would suggest aiming for readability over speed. Of course you can be super-readable but too slow, as in this super-concise version:.
This is slow because everytime you call this method, the regex will be compiled. So you can pre-compile the regex. This should be fast enough for most purposes, assuming the JVM's regex engine optimizes the character class lookup.
This is the solution I would use, personally. Now without profiling, I wouldn't know whether you could do better by making your own character actually codepoint lookup table:. Again, I wouldn't dive into this kind of optimization. The code has become too hard to read. Is performance that much of a concern? Also remember that modern languages are JITted and after warming up they will perform better, so use a good profiler.
One thing that should be mentioned is that the example in the original question is highly non-performant because you are creating a whole bunch of temporary strings! Unless a compiler optimizes all that away, that particular solution will perform the worst.
This will likely perform better than using regular expressions, if you find them to slow for your needs. However, it could get messy fast if you have a long, distinct list of special characters you'd like to remove.
In this case regular expressions are easier to handle. Strings are immutable so its not good to try and use them very dynamically try using StringBuilder instead of String and use all of its wonderful methods!
It will let you do anything you want. Plus yes if you have something your trying to do, figure out the regex for it and it will work a lot better for you. Right now your code will iterate over all characters of tmp and compare them with all possible characters that you want to remove, so it will use number of tmp characters x number or characters you want to remove comparisons.
If I am not mistaken this approach is used with character class [ Learn more. Efficiently removing specific characters some punctuation from Strings in Java? Ask Question. Asked 6 years, 9 months ago.Need support for your remote team? Check out our new promo!
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Medium Priority. Last Modified: Does anyone know how to implement the functionality to remove the spaces and punctuation from a String retrieved from a database? For example, I am trying to remove all the spaces from the following fieldname, certificateName: "Annual's - Disclosure Form: " and have it save instead as "AnnualsDisclosureForms 4" Does anyone know a quick and convenient way to do this?
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Removing punctuations from a given string
View Solutions Only. Commented: Author Commented: Stringjava.Here's a quick line of Java code that takes a given input string, strips all the characters from that string other than lowercase and uppercase letters, and returns whatever is left:.
As you might be able to tell by looking at that line of code, the String class "replaceAll" method does the hard work for you, essentially removing any character in the output stream, as it converts the String named aString into a new String named newString. Remember that you can't modify a String, so you have to assign the output to a new String reference.
Again, in this example we've stripped all the characters except the lowercase and uppercase letters. As you might guess, you can strip all characters but letters and numbers by making a minor change to the replaceAll regular expression, like this:.
Java - strip unwanted characters from a string. By Alvin Alexander. Last updated: June 4, Strip all characters but letters and numbers As you might guess, you can strip all characters but letters and numbers by making a minor change to the replaceAll regular expression, like this: aString.
Java replaceAll: How to replace all blank characters in a String. Java alphanumeric patterns: How to remove non-alphanumeric characters from a Java String.
How to use multiple regex patterns with replaceAll Java String class. PHP: How to strip unwanted characters from a string. If you want to understand all the Buddhas The most difficult yoga asana is Anchorage, Alaska: Cruise ships canceled. A dementia story. Cousins the movie.python 3 how to remove white spaces
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