    /*

If your delimiters are slash-based, escape it:

    \/*

`*` means &quot;0 or more of the previous repeatable pattern&quot;, which can be a single character, a character class or a group.

I have a page where we&#39;re positioning a bunch of elements using CSS, and changing their &quot;top and left&quot; positions using JS.

I&#39;ve had reports that these things have been misaligned, but a user has the motive to lie about this to &quot;cheat&quot;, so I&#39;m not exactly sure whether they&#39;re telling the truth. I&#39;m trying to find a way to figure out whether they&#39;re lying or not, and to have some &quot;proof&quot;.

I know that Canvas has a method to copy image information from an image element, or another canvas element (kind of a BitBlt operation).

Would it be possible to somehow, with Canvas (or with something else, Flash, whatever), take a &quot;picture&quot; of a piece of the page?  
Again, I&#39;m not trying to take information from an `&lt;image&gt;`. I&#39;m trying to copy what the user sees, which is comprised of several HTML elements positioned absolutely (and I care most about those positions) and somehow upload that to the server.

I understand this can&#39;t be done, but maybe I&#39;m missing something.

Any ideas?

Can you take a &quot;screenshot&quot; of the page using Canvas?

Is it syntactically and semantically correct to nest `&lt;div&gt;` or any other block level element inside the `&lt;p&gt;` tag. I am talking about HTML4 Transitional DTD.

If not then is it OK to instead use `&lt;span style=&quot;display: block&quot;&gt;` instead?

Nesting block level elements inside the &lt;p&gt; tag... right or wrong?

What is the regular expression pattern to say:

&gt; zero or more occurrences of the character `/`

?

Regular expression: zero or more occurrences of optional character /

What is the regular expression pattern to say:
> zero or more occurrences of the character <code>/</code>
?

Many modern regex implementations interpret the `\w` character class shorthand as &quot;any letter, digit, or connecting punctuation&quot; (usually: underscore). That way, a regex like `\w+` matches words like `hello`, `&#233;l&#232;ve`, `GO&#196;_432` or `gefr&#228;&#223;ig`.

Unfortunately, Java doesn&#39;t. In Java, `\w` is limited to `[A-Za-z0-9_]`. This makes matching words like those mentioned above difficult, among other problems.

It also appears that the `\b` word separator matches in places where it shouldn&#39;t. 

What would be the correct equivalent of a .NET-like, Unicode-aware `\w` or `\b` in Java? Which other shortcuts need &quot;rewriting&quot; to make them Unicode-aware?

Unicode equivalents for \w and \b in Java regular expressions?

If I have a string with any type of non-alphanumeric character in it: 

    &quot;This., -/ is #! an $ % ^ &amp; * example ;: {} of a = -_ string with `~)() punctuation&quot;

How would I get a no-punctuation version of it in JavaScript:

    &quot;This is an example of a string with punctuation&quot;

How can I strip all punctuation from a string in JavaScript using regex?

I found this code in some website, and it works perfectly. It validates that the phone number is in one of these formats:  
**(123) 456-7890** or **123-456-7890**  

The problem is that my client (I don&#39;t know why, maybe client stuffs) wants to add another format, the ten numbers consecutively, something like this: **1234567890**.

I&#39;m using this regular expression,
  
    /^($)?\d{3}($)?(-|\s)?\d{3}(-|\s)\d{4}$/

How can I add that it also validates the another format? I&#39;m not good with regular expressions.  


Validate phone number with JavaScript

Is there anyway to detect if a JavaScript object is a regex?

For example, I would like to do something like this:

    var t = /^foo(bar)?$/i;
    alert(typeof t); //I want this to return &quot;regexp&quot;

Is this possible?

Thanks!

EDIT: Thanks for all the answers. It seems I have two very good choices:

    obj.constructor.name === &quot;RegExp&quot;

or

    obj instanceof RegExp

Any major pros/cons to either method?

Thanks again!

typeof for RegExp

I have tried:

    preg_match(&quot;/^[a-zA-Z0-9]&quot;, $value)

but im doing something wrong i guess.

Content Type	Original Author	Original Content on Stackoverflow
Question	Prem	View Question on Stackoverflow
Solution 1 - Regex	Jeff Ferland	View Answer on Stackoverflow

Regular expression: zero or more occurrences of optional character /

Regex Problem Overview

Regex Solutions

Solution 1 - Regex

Nesting block level elements inside the <p> tag... right or wrong?

Can you take a "screenshot" of the page using Canvas?

Attributions