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Replace string pattern but keep part of it [closed]

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I have a long document with some headings I want to replace in a operation.
The headings have the following structure (there are two nouns, both in with a uppercase first character, separated with a whitespace, also the time is dynamic):
let string = 'Firstname Lastname [00:01:02]';
I want to insert some characters at the front and the end of this string, but want to keep the content.
So the desired output should be something like:
let string = '{Firstname Lastname [00:01:02]}:';
I tried a little bit around with RegEx and can catch the time with the following pattern:
\[[0-9]{2}:[0-9]{2}:[0-9]{2}

I figured it out by using captures in my RegEx.
/(\b[A-Z][a-z]* [A-Z][a-z]*( [A-Z])?\b\s\[[0-9]{2}:[0-9]{2}:[0-9]{2}\])/g
This RegEx captures the pattern of my headings into group one. In a replace operation I can then insert the desired content.
string.replace(regex, '{$1}:')

Is there way to change a substring in js? [closed]

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I have a string like:
def definition():
I want to change word def (for example), every instance of word def but not the "def"s that are part of other words
like this
console.log("def definition():".specialReplace("def", "abc"));
and result should be
abc definition():
not
abc abcinition():

Use String#replace or String#replaceAll with a regular expression:
const specialReplace = (str) => str.replaceAll(/\bdef\b/g, 'abc')
console.log(specialReplace("def definition")) // abc definition
console.log(specialReplace("def definition def")) // abc definition abc
In the regular expression, \b is a boundary type assertion that matches any word boundary, such as between a letter and a space.
Note that the same sequence \b is also used inside character class regular expression positions ([\b]), to match the backspace character.

Regx for correct filename 1201_17-11-2015.zip [closed]

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I need to check whether a given file name is in the correct format or not.
Means:
first four numbers_two numbers-two numbers-4 numbers.zip
for that I need a regular expression.
Example file name is (1201_17-11-2015.zip) in javascript

var re = new RegExp('^\d{4}_\d{2}-\d{2}-\d{4}.zip$');
if (filename.match(re)) {
//successful match
}

You regexp could look something like this:
^\d{4}_\d\d-\d\d-\d{4}.zip$
^ is the beginning of your pattern
\d means any number
{n} means that the last pattern has to exist n-time
$ is the end of your pattern
On this site you can start learning how to use regular expression
Here you can test if your own regular expression is working...

I find it best to test scenarios at RegExr. None the less, what you're asking for is basic:
var result = "1201_17-11-2015.zip".match(/\d{4}_\d{2}-\d{2}-\d{4}\.zip/)
if (result == null) {
console.warn("Unable to find a match");
} else {
console.log("Found match: %k", result);
}

javascript regex function [closed]

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I need to write JS regex (or function) that tells me if a string is in that format:
/root/:param1/:param2/:param3/.../
OR
/root/:param1/:param2/:param3/... (without last slash)
Any ideas?
Thanks.

If I'm interpreting your question correctly, it looks like we can break this pattern down into three primary components:
Start with /root
Followed by some number of /:param
Optionally followed by a /
Now we just need to develop the regular expressions for each component and combine them:
Start with /root
Start of the string is marked by ^ and we follow with /root
^/root
Followed by some number of /:param:
Let's say :param should match 1-N characters (+ operator) that are not a forward slash [^/]
This gives us /[^/]+
0-N of this entire unit can be matched using groups and the * operator: (/[^/]+)*
Optionally followed by a /
Use the ? operator: /?
Append a $ to specify the string's end
All together we get the regular expression ^/root(/[^/]+)*/?$. You can use RegExp.prototype.test to check for matches:
r = new RegExp('^/root(/[^/]+)*/?$')
r.test('/root') // => true
r.test('/root/') // => true
r.test('/root/apple/banana') // => true
r.test('/root/zebra/monkey/golf-cart/') // => true
If you're looking to match a URL path segment you'll need to use a more specific character set instead of the [^/] I used here for :param characters.

How to split string with several char [closed]

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How to split string with several char
i have to split a scope when there are spaces, comma, dash, etc..( ponctuation) and when words are concatenated ( without a space between variable)
For exemple
testOne="{{test.test}} {{test.test}}{{test.test}}";
The expected output is
"test.test test.testtest.test"
(There are two comma between the first and the second text.text)

You can use Regular Expression to get the result what you wanted.
testOne = "{{test.test}} {{test.test}}{{test.test}}";
console.log(testOne.match(/{{.*?}}/g).map(function(item) {
return item.replace(/[{}]/g, "");
}));
# [ 'test.test', 'test.test', 'test.test' ]

You can achieve your desired output with a simple replace
testOne.replace(/{{(.*?)}}/g, '$1');
// "test.test test.testtest.test"
Remember to set this back to testOne if you want it kept as that variable