Need assistance creating a regular expression to remove specific characters from a string. Here is the list of characters to be removed:
public static char[] delimiters = { ' ', '\r', '\n', '?', '!', ';', '.', ',', '`', ':', '(', ')', '{', '}', '[', ']', '|', '\'', '\\', '~', '=', '@', '>', '<', '&', '%', '-', '/', '#' };
let input = "...";
let output = input.replace(/[ \r\n?!:;\-(){}\[\]\\'"=@><&%\/#]+/g, '');
It is possible that I overlooked a few characters.
Instead of using a blacklist approach, another option is to use a whitelist:
let output = input.replace(/[^\w]+/g, '');
This will eliminate anything that isn't considered a word character, such as letters (uppercase or lowercase), digits, or underscores.
Here is the regular expression you need to use:
var re = /[ \r\n?!;.,`:(){}\[\]\|\'\\~=@><&%-\/#]/g;
For instance:
var test = "j a\nv\ra?s!c;r.i,p`t:I(s)A{w}e[s]o|m'e\\~=@><&%-/#";
test.replace(re, '')
>>> "javascriptIsAwesome"
Just so you know, the usual format for this type of expression in regular expressions is "/[...]/" - which means, "match any character within the brackets"
Give this a shot:
const delimiters = [' ', '\r', '\n', '?', '!', ';', '.', ',', '`', ':', '(', ')', '{', '}', '[', ']', '|', '\'', '\\', '~', '=', '@', '>', '<', '&', '%', '-', '/', '#'],
regex = new RegExp("[" + delimiters.join("").replace(/[-\\\]]/g, "\\$&") + "]", "g");
str = str.replace(regex, "");
To handle this situation, you can create a custom function that will escape any special characters in a regular expression, then apply the regex and return the modified string:
String.prototype.escapeChars = function(specialChars) {
for(var i=0; i<specialChars.length; i++) {
if(specialChars[i].match(/\W/)) {
specialChars[i] = '\\'+specialChars[i];
}
}
return this.replace(new RegExp('['+specialChars.join('')+']', 'g'), '');
};
var inputString = "j a\nv\ra?s!c;r.i,p`t:I(s)A{w}e[s]o|m'e\\~=@><&%-/#";
inputString.escapeChars([' ', '\r', '\n', '?', '!', ';', '.', ',', '`', ':', '(', ')', '{', '}', '[', ']', '|', '\'', '\\', '~', '=', '@', '>', '<', '&', '%', '-', '/', '#']);
// result: "JavascriptIsAwesome"
This seems a bit intense.
/[^A-z0-9]/g
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