Here's one you can play with
(?:[\A-Z]\+ *)|\h

<div>
Try replacing:<br />

<pre><code id="code-20-42945810-1">(?&lt;=[GLPMHS])\h(?=[GLPMHS])</code></pre>
with an empty string.
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Try replacing:


(?<=[GLPMHS])\h(?=[GLPMHS])

with an empty string.

End-user support

NVIT

tmajor99

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<div class="content wysiwyg-content">
I need help with a regex to check for a letter and space following. &nbsp;I need to replace all the spaces between letters &quot;G, L, P, M, H, S&quot;. &nbsp;<br />
<br />
Data: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Results<br />
-------------- &nbsp; &nbsp;------------<br />
1.2 G P M &nbsp; &nbsp; 1.2 GPM <br />
99 L P M &nbsp; &nbsp; &nbsp; &nbsp;99 LPM &nbsp; &nbsp;<br />
1.5 L P S &nbsp; &nbsp; &nbsp; &nbsp;1.4 LPS<br />
88 G P S &nbsp; &nbsp; &nbsp; &nbsp;88 GPS
</div>
</div>


I need help with a regex to check for a letter and space following.  I need to replace all the spaces between letters "G, L, P, M, H, S".  

Data:            Results
--------------    ------------
1.2 G P M     1.2 GPM 
99 L P M        99 LPM    
1.5 L P S        1.4 LPS
88 G P S        88 GPS

Regular Expression to replace spaces after certain letters

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.