This question already has answers here:
How do I replace all occurrences of a string in JavaScript?
(78 answers)
Closed 7 years ago.
I am trying to find all the characters ('?') of a URL and replace it with &.
For instance, i have var test = "http://www.example.com/page1?hello?testing";
I first attempted:
document.write(test.replace("&","?"))
This resulted in that only the first ? would be replaced by & , then I found a question saying that I could add a g(for global)
document.write(test.replace("&"g,"?"))
Unfortunately, this did not have any effect either.
So how do I replace all characters of type &?
You need to escape the ? character like so:
test.replace(/\?/g,"&")
You're almost there.
the thing you saw in SO is regex replace :
document.write(test.replace(/\?/g,"&")) ( I thought you wanted to change & to ? , but you want the opposite.)
with the G flag - it will replace all the matches in the string
without it - it will replace only the first match.
Related
This question already has answers here:
How do I replace all occurrences of a string in JavaScript?
(78 answers)
Closed 2 years ago.
I got following code snippet, it's pretty simple,
var b = "'aa','bb'";
console.log(b.replace("'", ""));
// result is "aa','bb'"
I want replace all single quote signs with blank. So my expected output should be "aa,bb", but the actual output is "aa','bb'" neither run this code snippet in Node nor browser. Seems only the first single quote sign has been replaced.
I already got a workaround to resolve this problem by replace with regex. What I wanna know
is what happened to replace function here? I cannot figure this out.
Try using RegEx specifying the global flag (g) that matches the pattern multiple times. Please also note that, as replace() does not modify the original string you have to reassign the modified value to the variable:
var b = "'aa','bb'";
b = b.replace(/'/g, "");
console.log(b);
This question already has answers here:
Remove all backslashes in Javascript
(4 answers)
Closed 4 years ago.
I am trying to convert string that has following values
"A\"s\"sets"
my goal is to remove from string \ values no matter how many of them appear in string.
"A"s"sets"
I tried using new RegExp but I do not manage to perform that operation.
I even managed to create regex that will pick up everything except \ sign
[a-zA-Z0-9'"*]
I also tried calling on
regex.exec(string)
but I am getting an array instead of cleared string.
Anyone have any idea how to do this ?
Thank you
You can use replace.
let str = `"A\"s\\"sets"`
let op = str.replace(/\\+/g, '')
console.log(op)
This question already has answers here:
Is there a RegExp.escape function in JavaScript?
(18 answers)
Closed 5 years ago.
Is there any way to make something.+()[]* matching literally 'something.+()[]*'? I'm using regex builder so manual escaping is not allowed. Sure, i can add hardcoded checks if (char === '+') return '\+' but i'm looking for native solution or better way
UPD
I'm sorry. I forgot to add that matching should be in given order with moving forward but not back. So [+.] will not fit my requirements because it will match both +. and .+. I need only first case (In definition order)
You don't need to escape them if within square brackets.. I just tested and works for me, but maybe not what you are looking for?
something[.+()[]]
This question already has answers here:
How to get the file name from a full path using JavaScript?
(21 answers)
Closed 6 years ago.
I need a regex that would replace something like this but leave the file name.
/folder1/folder2/folder3/anything/somefile.html
Also could someone show me how to implement this with replace method? Replacing the entire path match to empty string and again leaving the file and which would be anything.
Thanks in advance.
You can do it without regular expressions:
var filename = string.split('/').pop();
// "somefile.html"
You can use .*\/.
. will match anything
* will repeat the previous zero or more times.
\/ is a literal slash (/). But needs to be escaped because it's part of the regex construct:
var str = '/folder1/folder2/folder3/anything/somefile.html';
str.replace(/.*\//, ''); // "somefile.html"
This question already has answers here:
JavaScript regex multiline text between two tags
(5 answers)
Closed 7 years ago.
I have this regex in Ruby: http://rubular.com/r/eu9LOQxfTj
/<sometag>(.*?)<\/sometag>/im
And it successfully matches input like this:
<sometag>
123
456
</sometag>
Which would return
123
456
However, when I try this in javascript (testing in chrome), it doesn't match anything.
Does javascript's multiline flag mean something else?
I want to capture everything non-greedily between two given tags.
How can I accomplish this in javascript using regex? Here is a Debuggex Demo
<sometag>(.*?)<\/sometag>
This is not XML parsing.
Javascript does not support multiline expressions when using . alone. You have to use [\s\S] in place of . so an example that satisfies what you want would be:
var x = "<sometag>\n\
123\n\
456\n\
</sometag>";
var ans = x.match(/<sometag>([\s\S]*?)<\/sometag>/im).pop();
// ans equals " 123 456"
note that you still need the m modifier.