Develop Reference

How to find all regex match in a string

This might be too simple to find on web but I got problem with finding the answer.
I get string as http response text that contain substrings I want to grab all one by one to further process. Its relative URL.
for example:
var string = "div classimage a hrefstring1.png img idEMIC00001 he19.56mm wi69.85mm srcstring1.png separated by some html div classimage a hrefstring2.png srcstring2.png div separated by some html many such relative urls";
var re = new RegExp("[a-z]{5,10}[0-9].png");
var match = re.exec(string)
WScript.Echo (match);
This gives first match. I want to get all collection one by one. I am using Jscript. I am new to javascript.
After the answer I tried this.
var string = "div classimage a hrefstring1.png img idEMIC00001 he19.56mm wi69.85mm srcstring1.png separated by some html div classimage a hrefstring2.png srcstring2.png div separated by some html many such relative urls";
var re = new RegExp("[a-z]{5,10}[0-9].png", "g");
var match = re.exec(string)
WScript.Echo (match);
But no luck.

use 'g' for a global search and match to get all matches:-
var string = "div classimage a hrefstring1.png img idEMIC00001 he19.56mm wi69.85mm srcstring1.png separated by some html div classimage a hrefstring2.png srcstring2.png div separated by some html many such relative urls";
var re = new RegExp("[a-z]{5,10}[0-9].png", 'g');
var matches = string.match(re);
for(var i = 0; i < matches.length; i++){
console.log(matches[i]);
}

This should fix your problem :
var re = new RegExp("[a-z]{5,10}[0-9].png", "g");
The "g" stands for global, it'll match all occurrences in your string

just make it
var match = string.match(re)
instead of
var match = re.exec(string);
rest of the code seems to be fine.

using multiple .replace calls on an array of variables in Javascript / jQuery

I am working on a tool that would receive text that has been copied from a word document, and return an html output for copy/paste into an email client for email marketing.
During this process, one of the steps the tool needs to handle is the replacement of special characters within the copied values. The output needs to show the encoded values so when they are copied into the email client, they render accordingly during the mail send process
The problem is that there are multiple inputs the user can populate and right now the code is VERY WET... I want to set up the tool to be a little cleaner, and not repeat the code as often.
Currently the input is given to the tool via a prompt();
I am taking that input and replacing the special characters ™, ®, Ø, ´, ”, ‟ and others (partial list given for this example) as needed:
JS (Commented Version)
msg2 = prompt("enter text here");
//long version to tag each replacement with it's identifying name
msg2 = msg2.replace(/[\u0027]/g, '''); // Apostrophe ´
msg2 = msg2.replace(/[\u2122]/g, '™'); // trademark ™
msg2 = msg2.replace(/[\u00AE]/g, '®'); // R-Ball ®
msg2 = msg2.replace(/[\u201c]/g, '"'); // Left Double Quote ‟
msg2 = msg2.replace(/[\u201D]/g, '"'); // Right Double Quote ”
msg2 = msg2.replace(/[\u2018]/g, '''); // Left Single Quote ‛
msg2 = msg2.replace(/[\u2019]/g, '''); // Right Single Quote ’
msg2 = msg2.replace(/[\u2022]/g, 'ߦ') // Bullet •
JS (Short Version)
msg2 = prompt("enter text here");
msg2 = msg2.replace(/[\u0027]/g, ''').replace(/[\u2122]/g,
'™').replace(/[\u00AE]/g, '®').replace(/[\u201c]/g,
'"').replace(/[\u201D]/g, '"').replace(/[\u2018]/g,
''').replace(/[\u2019]/g, ''').replace(/[\u2022]/g,
'ߦ');
BUT... I need to run this same replacement on a number of prompts. I don't want to repeat this in the code a bunch of times with each of the variables changing as needed.
What I would rather do is create a function to handle the replacement, and then simply create an array of the variables and run the function on the array...
Example
function txtEncode () {
...replacment code here...
}
var inputTxt = [msg1, msg2, msg3...];
for (var i=0; i < inputTxt.length; i++){
txtEncode(i)
}

Just make an array with replacement pairs:
var replacements = [ ["&", "&"], ["'", """] etc
and apply them one by one:
replacements.forEach(function(pair) {
msg = msg.split(pair[0]).join(pair[1]);
});
split/join is better to replace literal strings than .replace which is intended for use with regular expressions.
Also, your encoding doesn't look right, ® will be displayed as ®, not as ®

You can use a global find/replace function and extend the string prototype, I have this code in one of my fiddles, but I can't find the origin.
Code:
String.prototype.replaceArray = function(find, replace) {
var replaceString = this;
var regex;
for (var i = 0; i < find.length; i++) {
regex = new RegExp(find[i], "g");
replaceString = replaceString.replace(regex, replace[i]);
}
return replaceString;
};
var msg2 = 'demo \u0027'
var find = ["\u0027"];
var replace = ["&#39;"];
msg2 = msg2.replaceArray(find, replace);
Demo: http://jsfiddle.net/IrvinDominin/YQKwN/

Add a method to the String object for your code.
String.prototype.myCleanString = function(){
return this.replace(/[\u0027]/g, ''')
.replace(/[\u2122]/g,'™')
.replace(/[\u00AE]/g, '®')
.replace(/[\u201c]/g, '"')
.replace(/[\u201D]/g, '"')
.replace(/[\u2018]/g, ''')
.replace(/[\u2019]/g, ''')
.replace(/[\u2022]/g, 'ߦ')
.replace(/foo/g, 'bar');
}
Call as needed... http://jsfiddle.net/XKHNt/

Use JavaScript string operations to cut out exact text

I'm trying to cut out some text from a scraped site and not sure what functions or library's I can use to make this easier:
example of code I run from PhantomJS:
var latest_release = page.evaluate(function () {
// everything inside this function is executed inside our
// headless browser, not PhantomJS.
var links = $('[class="interesting"]');
var releases = {};
for (var i=0; i<links.length; i++) {
releases[links[i].innerHTML] = links[i].getAttribute("href");
}
// its important to take note that page.evaluate needs
// to return simple object, meaning DOM elements won't work.
return JSON.stringify(releases);
});
Class interesting has what I need, surrounded by new lines and tabs and whatnot.
here it is:
{"\n\t\t\t\n\t\t\t\tI_Am_Interesting\n\t\t\t\n\t\t":null,"\n\t\t\t\n\t\t\t\tI_Am_Interesting\n\t\t\t\n\t\t":null,"\n\t\t\t\n\t\t\t\tI_Am_Interesting\n\t\t\t\n\t\t":null}
I tried string.slice("\n"); and nothing happened, I really want a effective way to be able to cut out strings like this, based on its relationship to those \n''s and \t's
By the way this was my split code:
var x = latest_release.split('\n');
Cheers.

Its a simple case of stripping out all whitespace. A job that regexes do beautifully.
var s = " \n\t\t\t\n\t\t\t\tI Am Interesting\n\t\t \t \n\t\t";
s = s.replace(/[\r\t\n]+/g, ''); // remove all non space whitespace
s = s.replace(/^\s+/, ''); // remove all space from the front
s = s.replace(/\s+$/, ''); // remove all space at the end :)
console.log(s);
Further reading: https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/RegExp

var interesting = {
"\n\t\t\t\n\t\t\t\tI_Am_Interesting1\n\t\t\t\n\t\t":null,
"\n\t\t\t\n\t\t\t\tI_Am_Interesting2\n\t\t\t\n\t\t":null,
"\n\t\t\t\n\t\t\t\tI_Am_Interesting3\n\t\t\t\n\t\t":null
}
found = new Array();
for(x in interesting) {
found[found.length] = x.match(/\w+/g);
}
alert(found);

Could you try with "\\n" as pattern? your \n may be understood as plain string rather than special character

new_string = string.replace("\n", "").replace("\t", "");

Remove HTML Tags From A String, Using jQuery

I have a simple string e.g.
var s = "<p>Hello World!</p><p>By Mars</p>";
How do I convert s to a jQuery object? My objective is to remove the <p>s and </p>s. I could have done this using regex, but that's rather not recommended.

In the simplest form (if I am understanding correctly):
var s = "<p>Hello World!</p><p>By Mars</p>";
var o = $(s);
var text = o.text();
Or you could use a conditional selector with a search context:
// load string as object, wrapped in an outer container to use for search context
var o = $("<div><p>Hello World!</p><p>By Mars</p></div>");
// sets the context to only look within o; otherwise, this will return all P tags
var tags = $("P", o);
tags.each(function(){
var tag = $(this); // get a jQuery object for the tag
// do something with the contents of the tag
});
If you are parsing large amounts of HTML (for example, interpreting the results of a screen scrape), use a server-side HTML parsing library, not jQuery (tons of posts on here about HTML parsing).

To get all the strings there use
var s = "<p>Hello World!</p><p>By Mars</p>";
var result = "";
$.each($(s), function(i){
result += " " + $(this).html();
});

if you don't want regex, why don't u just:
var s = "<p>Hello World!</p><p>By Mars</p>";
s = s.replace('<p>', '').replace('</p>', '');

How do I extract a background= value from a string containing HTML in JavaScript?

I have a string containing HTML loaded from another page, how do I extract the background property from it's body tag using Javascript?
The body tag in the string looks like this:
<body onload='init();' background='storage/images/jsb_background.jpg' link='#000000' vlink='#000000' alink='#000000' leftmargin='0' topmargin='0' marginwidth='0' marginheight='0'>
Thanks!

I patched together a regex to do this, which will search the data string variable (containing the HTML) for the background attribute of the body tag. The regex is stolen from here and modified a bit. I'm still new to regex, so I guess it can be done more fluently, but it still gets the job done
var data = /* your html */;
var regex = /body.*background=["']?((?:.(?!["']?\s+(?:\S+)=|[>"']))+.)["']?/;
var result = regex.exec(data);
if (result.length > 1) {
var background = result[1];
alert(background);
}
else {
//no match
}

This is my answer as I understand your problem (given the limited details and no code example)...
This is also assuming that your HTML string is valid html...
var html = yourString;
var background = "";
background = $(html).find("body").attr("background");
If you aren't actually appending your HTML string to the DOM there may not be a nice and easy jQuery way to do this. You may have to parse out the background attribute by hand.
var html = yourString;
var charStart = html.indexOf("<body");
var charEnd = html.indexOf(">", charStart);
var bodyTag = html.substring(charStart,charEnd+1);
charStart = bodyTag.indexOf("background='")+12;
charEnd = bodyTag.indexOf("'",charStart+13);
var background = bodyTag.substring(charStart,charEnd);