Capture-d-e-cran-2018-01-24-a--17.32.png

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What changes do I have to make to modify this to match <b>testcreditcard</b>. and <b>creditcard.</b><br />

<pre><code id="code-10-29080126-1">if (currHost.match(/(accountopening\.|creditcard\.|web\.oflows\.us|blog\.)/i)) { }</code></pre>
I thought it should it be something like the below but that seems to allow anything infront of creditcard : <br />

<pre><code id="code-10-29080126-2">if (currHost.match(/(accountopening\.|(test)?creditcard\.|web\.oflows\.us|blog\.)/i)) { }</code></pre>
Thanks!
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What changes do I have to make to modify this to match testcreditcard. and creditcard.
(CODE)
I thought it should it be something like the below but that seems to allow anything infront of creditcard : 
(CODE)
Thanks!

Simple JavaScript Regex Question About Optional String

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.