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Would you allow leading / trailing blanks, and just trim them off, or would you like to reject inputs with any empty space?<br />
<br />
You might enjoy this article that shows how we go about building regular expressions, and testing them for success:<br />
<a href="https://www.experts-exchange.com/articles/7830/A-Quick-Tour-of-Test-Driven-Development.html" rel="ugc">https://www.experts-exchange.com/articles/7830/A-Quick-Tour-of-Test-Driven-Development.html</a>
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Would you allow leading / trailing blanks, and just trim them off, or would you like to reject inputs with any empty space?

You might enjoy this article that shows how we go about building regular expressions, and testing them for success:
https://www.experts-exchange.com/articles/7830/A-Quick-Tour-of-Test-Driven-Development.html [https://www.experts-exchange.com/articles/7830/A-Quick-Tour-of-Test-Driven-Development.html]

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Thanks I would just stop the script with an error until the leading blank spaces could be sorted.<br />
<br />
oBda doesnt mention the blank space, is that dealt with the expression anyway?<br />
'\A[a-zA-Z0-9-]{1,8}\Z'
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Thanks I would just stop the script with an error until the leading blank spaces could be sorted.

oBda doesnt mention the blank space, is that dealt with the expression anyway?
'\A[a-zA-Z0-9-]{1,8}\Z'

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Yes, since the space isn't in the set of allowed characters.
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Yes, since the space isn't in the set of allowed characters.

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Is the /A /Z syntax compatible with powershell, rather than ^ and $?<br />
<br />
Thanks
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Is the /A /Z syntax compatible with powershell, rather than ^ and $?

Thanks

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how about allowing white space anywhere other than at the start or beginning?<br />
<br />
Thanks
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how about allowing white space anywhere other than at the start or beginning?

Thanks

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<div class="content wysiwyg-content">
Hello, I want to only allow an input if it satisfies the following, can you please advise on a suitable regex expression.<br />
<br />
<b>Less than or equal to 8 characters<br />
Does not have a preceding or following empty space<br />
Is only made up of a-z, A-Z, 0-9 or a hyphen -</b><br />
<br />
clear, rather than concise preferred...<br />
<br />
Thanks
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Hello, I want to only allow an input if it satisfies the following, can you please advise on a suitable regex expression.

Less than or equal to 8 characters
Does not have a preceding or following empty space
Is only made up of a-z, A-Z, 0-9 or a hyphen -

clear, rather than concise preferred...

Thanks

regex expression

Windows PowerShell is a task automation and configuration management framework from Microsoft, consisting of a command-line shell and associated scripting language built on the .NET Framework. PowerShell provides full access to the Component Object Model (COM) and Windows Management Instrumentation (WMI), enabling administrators to perform administrative tasks on both local and remote Windows systems as well as WS-Management and Common Information Model (CIM) enabling management of remote Linux systems and network devices.

Powershell

PHP is a widely-used server-side scripting language especially suited for web development, powering tens of millions of sites from Facebook to personal WordPress blogs. PHP is often paired with the MySQL relational database, but includes support for most other mainstream databases. By utilizing different Server APIs, PHP can work on many different web servers as a server-side scripting language.

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.