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JavaScript how to strip/remove a char from string [duplicate]

This question already has answers here:
How can I remove a character from a string using JavaScript?
(22 answers)
Closed 5 years ago.
I'm looking on how to remove a char from a string for example let's say i have "#22UP0G0YU" i want it to remove the # from it how would i do? I also have a small little other question too about how to make string upper case as well thanks in advance.

To remove a specific char I normally use replace, also good for a set of chars:
var str = '#22UP0G0YU';
var newString = str.replace('#', ''); // result: '22UP0G0YU'
To Uppercase, just use .toUpperCase();
var str = '#22UP0G0yu';
var newString = str.replace('#', '').toUpperCase(); // result: '22UP0G0YU'

Parsing regex in javascript [duplicate]

This question already has answers here:
JavaScript Regex, where to use escape characters?
(3 answers)
Closed 8 years ago.
I'm unable to parse a regex. I've tested it from regexpal.com and regex101.com (by setting the expression as "(?:^csrf-token|;\s*csrf-token)=(.*?)(?:;|$)" and the test string as "__ngDebug=false; csrf-token=b2ssOJ4jNOlPdmXAHn4CORPvFoO4Ngsupej25tdj") where it works.
The example is jsfiddle.
function getCookie(name) {
var s = "__ngDebug=false; csrf-token=b2ssOJ4jNOlPdmXAHn4CORPvFoO4Ngsupej25tdj";
var regexp = new RegExp("(?:^" + name + "|;\s*"+ name + ")=(.*?)(?:;|$)", "g");
var result = regexp.exec(s);
return (result === null) ? null : result[1];
}
alert(getCookie("csrf-token"));
If however s is "csrf-token=b2ssOJ4jNOlPdmXAHn4CORPvFoO4Ngsupej25tdj", then it works fine. Please tell me what's wrong.
The expected output is "b2ssOJ4jNOlPdmXAHn4CORPvFoO4Ngsupej25tdj", and there is no input (the string to be tested is 's').

Change
"|;\s*"
to
"|;\\s*"
^
The thing is, you are constructing the RegExp by passing in a string via the constructor, so you need to follow the rule of escaping in string literal. In JavaScript, "\s" is recognized as a single character string, with lowercase s. To specify \, you need to escape it.

You should escape \s
var regexp = new RegExp("(?:^" + "csrf-token" + "|;\\s*"+ "csrf-token" + ")=(.*?)(?:;|$)", "g");
^

Regex that detects greater than ">" and less than "<" in a string [duplicate]

This question already has answers here:
Regular expression greater than and less than
(3 answers)
Closed 8 years ago.
I need a regular expression that replaces the greater than and less than symbol on a string
i already tried
var regEx = "s/</</g;s/>/>/g"
var testString = "<test>"
alert(testString.replace(regEx,"*"))
My first time to use it please go easy on me :)
Thanks

You can use regEx | like
var regEx = /<|>/g;
var testString = "<test>"
alert(testString.replace(regEx,"*"))
Fiddle

For greater than and less than symbol.
var string = '<><>';
string = string.replace(/[\<\>]/g,'*');
alert(string);
For special characters
var string = '<><>';
string = string.replace(/[&\/\\#,+()$~%.'":*?<>{}]/g,'_');
alert(string);

Insert the regular expression in the code before class
using System.Text.RegularExpressions;
below is the code for string replace using regex
string input = "Dot > Not Perls";
// Use Regex.Replace to replace the pattern in the input.
string output = Regex.Replace(input, "some string", ">");
source :
http://www.dotnetperls.com/regex-replace

How to extract numbers from string in Javascript using regex [duplicate]

This question already has answers here:
Find and get only number in string
(4 answers)
Closed 8 years ago.
I have the following string
/Date(1317772800000)/
I want to use a Javascript regular expression to extract the numerical portion of it
1317772800000
How is this possible?

That should be it
var numPart = "/Date(1317772800000)/".match(/(\d+)/)[1];

No need for regex. Use .substring() function. In this case try:
var whatever = "/Date(1317772800000)/";
whatever = whatever.substring(6,whatever.length-2);

This'll do it for you: http://regex101.com/r/zR0wH4
var re = /\/Date\((\d{13})\)\//;
re.exec('/Date(1317772800000)/');
=> ["/Date(1317772800000)/", "1317772800000"]
If you don't care about matching the date portion of the string and just want extract the digits from any string, you can use this instead:
var re = /(\d+)/;
re.exec('/Date(1317772800000)/')
["1317772800000", "1317772800000"]

How can I get the last character in a string? [duplicate]

This question already has answers here:
How can I get last characters of a string
(25 answers)
Closed 10 years ago.
If I have the following variable in javascript
var myString = "Test3";
what is the fastest way to parse out the "3" from this string that works in all browsers (back to IE6)

Since in Javascript a string is a char array, you can access the last character by the length of the string.
var lastChar = myString[myString.length -1];

It does it:
myString.substr(-1);
This returns a substring of myString starting at one character from the end: the last character.
This also works:
myString.charAt(myString.length-1);
And this too:
myString.slice(-1);

var myString = "Test3";
alert(myString[myString.length-1])
here is a simple fiddle
http://jsfiddle.net/MZEqD/

Javascript strings have a length property that will tell you the length of the string.
Then all you have to do is use the substr() function to get the last character:
var myString = "Test3";
var lastChar = myString.substr(myString.length - 1);
edit: yes, or use the array notation as the other posts before me have done.
Lots of String functions explained here

myString.substring(str.length,str.length-1)
You should be able to do something like the above - which will get the last character

Use the charAt method. This function accepts one argument: The index of the character.
var lastCHar = myString.charAt(myString.length-1);

You should look at charAt function and take length of the string.
var b = 'I am a JavaScript hacker.';
console.log(b.charAt(b.length-1));