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I want to have a validation for my Math equations
Let us assume I have equations as follows:
1) x + y = e // valid equation
2) x + sin(x) = y //valid equation
3) a + wq = c // invalid equation
4) sin(x) + s =y //invalid equation // as s is not wanted only x,y,e characters are allowed to type in
I only want to allow equations which may contain x,y any other special character like e , also the functions like sin,cos,tan,sec,csc,cot,arcsin,asrccos,arctan,arcsec,arccot etc.
But if the equation contains a single letter like the above equation then the equation is not valid.
So can anybody provide me with a Math Regex that would help me validate?
Thank in advance!!
I had the same thing happen to me. The content security policy prevents the ChromeExtension from being able to access the GLOBALS array, which make sense. The Chrome Extension ideally should be sandboxed, as Chrome Extensions have extended permissions.
That being said this is the wild west AND gmail.js is an unsupported JS library that could change with changes in the Gmail code, so you are already assuming a fair amount of risk by using it.
It is possible to inject the Gmail.js code into the Gmail application and instructions are outlined here
https://github.com/KartikTalwar/gmail-chrome-extension-boilerplate
Use the structure here and you should be able to access the GLOBALS array within GMail.
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So in go, I do a calculation which gives "5726718050568503296"
In JS it gives "5726718050568503000"
I would like to replicate this behavior in go
As discussed in the comments of Why is 5726718050568503296 truncated in JS as others have mentioned, this is caused by the way toString() is implemented in JavaScript which appears to use the minimium number of significant digits to return the same represented number, rather than returning the mathematically closest number. You can however replicate this behaviour in Go by using the special -1 precision with strconv.FormatFloat:
package main
import (
"fmt"
"strconv"
)
func main() {
n, _ := strconv.ParseInt(strconv.FormatFloat(5726718050568503296.0, 'f', -1, 64), 10, 64)
fmt.Println(n)
}
Playground link: https://play.golang.org/p/9ZObcB3so4o
Seems like there is no easy way around it.
JS has its way of representing the Number type and the integer you presented basically overflows the capacity of it.
Please refer to: https://stackoverflow.com/a/1379973/10316247 for more information about how JS handles this and why this wierd behavior happens.
Replicate that in go would be very very trick as you'd need to look at the byte representation of this int and try to assume how JS would handle it.
I would (as the link above suggests) use it as and string.
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I've noticed that on Facebook I can do facebook.com/firstname.lastname but twitter does not allow this.
I can not use dots, I have to use twitter.com/firstnamelastname.
Dots make it more readable plus I want all my public profiles to be the same. I don't want to use the allowed underscore ( _ )
As far as URLs go, dots hold no special value so I don't understand why they are forbidden.
This question was also asked on quora.com with out an answer here
There is not a technical reason not to allow dots in the URL as they are a valid character.
From a user experience perspective it is a poor choice as it limits the user unnecessarily.
The simple answer is because someone decided to do it this way. It might be that their framework doesn't allow for dots, or it might be that the developer decided that this charset (alphanumerics + underscore) is enough. In the end, no one but the original developer will have a proper answer, but most probably it was just an arbitrary choice.
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I need help
I have a form feild I need to add validation to. The format of the value has to be specific. I want to define a regex pattern to handle it.
The format needs to allow L123456
L = it has to be L which is the start of out skus
123456 = I need to confirm they are entering a 6 digit number.
thanks
Jeff
var str = "L123456";
/^L\d{6}$/.test(str)
The pattern uses the ^ to determine the strings starts with. \d{6} states 6 digits, and $ means end of string. See: http://www.regular-expressions.info/ for more info.
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I've been playing around with a little HTML tester, that has a cool function to share. This redirects you to the shared URL. The problem is, the URL is WAY too long! Is there a way I can shorten these variable values?
I can md5() a string, and that will create a much shorter string, but I need a way to decrypt it. This is not for security purposes, it's purely for aesthetics.
Any help appreciated, thanks in advance!
The most obvious way: Make a table in a database. Put in it one field for the original string, and one for the md5 hash. When you receive in an md5 hash, lookup the original string from the table. The problem is, what if two strings match the md5 hash??
So, it would be better for your purpose (just making a shorter reference to long urls) to just generate a random string (of a certain length) per original input and associate it to the original by inserting it into a table where the random string has a unique contraint.
create table reftable (original varchar(500), shortened varchar(20) unique);
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I have a bunch of words (mostly locations, like Stockholm and London) and a bunch of strings. like "I want to go from stockholm to london". I want to find out what words are in what strings.
I currently use .indexOf to perform this task.
Is there a library, method, function etc, in javascript that identifies misspelled versions of words?
https://github.com/epeli/underscore.string#readme
Check out the levenshtein _.levenshtein(string1, string2) distance function. It can be used to calculate the distance between too strings.
I found this JS library http://www.javascriptspellcheck.com/ that is supposed to check spelling in several languages
After reading the above I'm not sure if I'm exactly clear on what you are trying to do... but regarding your final question about identifying words which are incorrectly spelled -- I'd take a look at java script spell check. And as a side note.. Often people try and use soundex when they want to count words which are spelled both correctly and incorrectly.
php by default has levenshtein function. you can use this method by using PHPJS library.
by finding the levenshtein distance between the word and a dictionary of correct words you can obtain a word with least levenshtein distance from the miss-spelled word. This would most probably be the correct spelling for a particular word.
In the past, I have used MissPlete library, which uses Jaro–Winkler distance algoritm by default.
It has no dependencies (not even jQuery), which I highly value.