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Let me know if you want the space for any invalid words removed too.
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Let me know if you want the space for any invalid words removed too.

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Using Regular Expressions and JavaScript, how can I remove all words that do not begin with xyz?
<pre><code id="code-10-28418773-1">var str = 'xyz1 xyz2 xyzzy hello world xyz555 xyzttt';
str = str.replace(???????????????????????????????????);
alert(str); // should be: hello world</code></pre>
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Using Regular Expressions and JavaScript, how can I remove all words that do not begin with xyz?(CODE)

JavaScript/REGEX: remove all words that do not begin with xyz

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.