<div>
Try this: it will return true or false.<br />

<pre><code id="code-8118288">function firstCharacterIsOne(str){
return str.match(/^1/);
}</code></pre>
</div>


Try this: it will return true or false.


function firstCharacterIsOne(str){
return str.match(/^1/);
}

<div>
actually for a US phone number the regex should be (without dashes)<br />
^1[2-9]\d{9}<br />
<br />
with dashes<br />
<br />
^1[2-9]\d{2}-\d{3}-\d{4}$<br />
<br />
<br />

</div>


actually for a US phone number the regex should be (without dashes)
^1[2-9]\d{9}

with dashes

^1[2-9]\d{2}-\d{3}-\d{4}$




<div>
<div class="content wysiwyg-content">
I need a RegEx pattern which tells me if the first character in a string is a 1 or not. This is going to be used on a telephone number like 15551234567. What I need to do is write a javascript function using RegEx to determine if the first character in the strong (telephone number) is a 1. <br />
<br />
Tried all sorts of different snippets from the web, but nothing seems to be working and I am very new at this RegEx things. <br />
<br />
Thanks
</div>
</div>


I need a RegEx pattern which tells me if the first character in a string is a 1 or not. This is going to be used on a telephone number like 15551234567. What I need to do is write a javascript function using RegEx to determine if the first character in the strong (telephone number) is a 1. 

Tried all sorts of different snippets from the web, but nothing seems to be working and I am very new at this RegEx things. 

Thanks

Help w/RegEx Needed

A regular expression ("regex") is a sequence of characters that define a search pattern, mainly for use in pattern matching with strings, or string matching, i.e. "find and replace"-like operations. Regular expression processors are found in several search engines, search and replace dialogs of several word processors and text editors, and in the command lines of text processing utilities, such as sed and AWK. Many programming languages provide regular expression capabilities, some built-in, for example Perl, JavaScript, Ruby, AWK, and Tcl, and others via a standard library, for example .NET languages, Java, Python and C++ (since C++11). Most other languages offer regular expressions via a library.

Regular Expressions

JavaScript is a dynamic, object-based language commonly used for client-side scripting in web browsers. Recently, server side JavaScript frameworks have also emerged. JavaScript runs on nearly every operating system and  in almost every mainstream web browser.