Hi i'm using mongodb and i=have few problems with mongodb regex
I have a collection with few fields and i want to search for a string in mongodb
when i enter this in my browser console,it is working fine and returning the count
posts.find({Headline: /google/i}).count()
it is returning the count which contains google as part of their headline
i tried this thing in my code and it is not returning count 0
var s_string="\/"+search_text+"\/";
var ss=Jobs.find({"J_Headline":search_text}).count();
console.log(ss);
whenever i give the full string of headline it is returning results
I don't know basics in regex help me with this.
Thx in advance
The search needs to be a RegExp object. Try this:
var search = new RegExp(search_text, 'i');
var ss=Jobs.find({'J_Headline': search}).count();
console.log(ss);
I think you also should check very good solution http://matteodem.github.io/meteor-easy-search/, it also have elastic search support
This is how regex can be used with MongoDB
db.<collection>.find({<field>: {$regex: /<key./}}).pretty()
Related
I am learning JavaScript and I see %value% in a code but I do not know what does it mean or how to use it. Can anyone please help me explain to me. Thank you very much.
var formattedLocation = HTMLworkLocation.replace("%data%", work.jobs[job].location);
"%data%" is just a literal string. This code will take the value of HTMLWorkLocation, look for the first occurrence of %data% in it, and replace that with the value of work.jobs[job].location, and store the resulting string in formattedLocation.
var work = {
jobs: [{
location: "Home office"
}]
};
var job = 0;
var HTMLworkLocation = "John is located at %data%";
var formattedLocation = HTMLworkLocation.replace("%data%", work.jobs[job].location);
console.log(formattedLocation);
This is probably part of a template system that's used to replace placeholders like %data% with values that come from a table.
You're using string.replace which takes a string or regular expression as it's first argument. Based on the code you posted it looks like you're looking for the string "%data%" (or whatever string you're looking for) in HTMLworkLocation and replacing it with the value in work.jobs[job].location. Then it is being stored in formattedLocation.
I would put a debugger; line after that line of code so you can see what the values are in the debugger console. That might help make more sense of things.
Here is more info on the str.replace method with some examples
I have url "SampleProject/profile/aA12". How can I get the value of the id from my rewritten URL using javascript? I want to get the "aA12" value.
Im using htaccess rewrite to rewrite my URL. Im new in rewritting url's. Any help will be appreciated. More powers and thank you.
You can use regex.
Try
'SampleProject/profile/aA12'.match(/\SampleProject\/profile\/(\w+)/)
'SampleProject/profile/aA12/xxx'.match(/\SampleProject\/profile\/(\w+)/)
'aA12' will be matched in both cases.
There are going to be quite a few ways to achieve your goal with JavaScript. A simple solution could be something like this:
let myURL = "SampleProject/profile/aA12";
let result = myURL.split('/').pop();
// returns "aA12"
The .split('/') method is dividing your string up into an array using the / character, and .pop() is simply returning the last element of that array.
Hope this helps! If you were looking for more advanced matching, i.e. if you wanted to ignore a potential query string on the end of the URL parameter, you could use regular expressions.
Their is a many way that you can use to achieve the desired method i made you a code pen in this link
var url = "SampleProject/profile/aA12";
let res = url.split('/').pop();
console.log(res)
https://codepen.io/anon/pen/KQxNja
I'm using Underscore.js library to check for email address string inside my collection, if exists, like this:
var emailExists = this.model.get('emailmailCollection').where( {emailAddress:emailAddressValue});
It works perfectly for strings like aa#a.com, etc. but when I match emails like Aa#a.com & aa#a.com, it doesn't show it exists.
Is there a way to test for emails with case-insensitive in place.
You can use filter instead.
var emailExists = this.model.get('emailmailCollection').filter(function(email){
return email.get('emailAddress').toUpperCase() === emailAddressValue.toUpperCase();
});
Wherever you are getting Aa#a.com, use the .toLowerCase() method on it and on your input. This way, all of your data is all lowercase.
For example:
console.log("Hello WOrLD".toLowerCase())
returns
hello world
this is a really amateurish way and probably won't work for you, but that's what I would try.
In application that I'am working on I have dynamically generated UI it is number of controls and listed entries depends on records from DB.What I'am trying to achieve is to write RegEx that would help me extract some numbers assigned as part of controls ID.
The way how I'am assigning IDs is : cText+(row that it represents in its group)+G+(group number).For example cText4G12
What I'am looking for is to get from that ID what Row it represents in example is 4 and it's group 12. I've never used RegEx before so I'am asking for your help :)
RegEx is not something that is easy to get your head around, so I would strongly recommend that you spend a bit of time to learn it - as it will be beneficial to you in the long run.
However, against my best judgement - here is code that will get you what you need..
var id = "cText4G12";
var result = id.match(/^cText(\d+)G(\d+)$/);
result[1] will contain "4"
result[2] will contain "12"
You don't really need regex. You can simply do:
var my_id = "cText4G12";
var row = my_id.slice(my_id.indexOf("cText")+5,my_id.indexOf("G"));
var group = my_id.slice(my_id.indexOf("G")+1);
I want to find anything that comes after s= and before & or the end of the string. For example, if the string is
t=qwerty&s=hello&p=3
I want to get hello. And if the string is
t=qwerty&s=hello
I also want to get hello
Thank you!
\bs=([^&]+) and grabbing $1should be good enough, no?
edit: added word anchor! Otherwise it would also match for herpies, dongles...
Why don't you try something that was generically aimed at parsing query strings? That way, you can assume you won't run into the obvious next hurdle while reinventing the wheel.
jQuery has the query object for that (see JavaScript query string)
Or you can google a bit:
function getQuerystring(key, default_)
{
if (default_==null) default_="";
key = key.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
var regex = new RegExp("[\\?&]"+key+"=([^&#]*)");
var qs = regex.exec(window.location.href);
if(qs == null)
return default_;
else
return qs[1];
}
looks useful; for example with
http://www.bloggingdeveloper.com?author=bloggingdeveloper
you want to get the "author" querystring's value:
var author_value = getQuerystring('author');
The simplest way to do this is with a selector s=([^&]*)&. The inside of the parentheses has [^&] to prevent it from grabbing hello&p=3 of there were another field after p.
You can also use the following expression, based on the solution provided here, which finds all characters between the two given strings:
(?<=s=)(.*)(?=&)
In your case you may need to slightly modify it to account for the "end of the string" option (there are several ways to do it, especially when you can use simple code manipulations such as manually adding a & character to the end of the string before running the regex).