<div>
What do you mean by &quot;validate&quot;? Your pattern should match each occurrence.
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What do you mean by "validate"? Your pattern should match each occurrence.

<div>
Additional about this:<br />
<br />
what needs to change in the regex in order to detect/allow besides<br />
<br />
BLCKX#123456 &nbsp; also &nbsp; BLCKX#12345678<br />
<br />
but not &nbsp;BLCK1:#1234567<br />
<br />
What is the difference &nbsp;between &nbsp; .*? &nbsp;(lazy) &nbsp; and &nbsp;[^#]
</div>


Additional about this:

what needs to change in the regex in order to detect/allow besides

BLCKX#123456   also   BLCKX#12345678

but not  BLCK1:#1234567

What is the difference  between   .*?  (lazy)   and  [^#]

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<div class="content wysiwyg-content">
Hello,<br />
<br />
I have a string of multiple 'blocks' of colors in Hex notation. The number of blocks can vary from 1 to 9. each is separated with one or more spaces.<br />
<br />
eg: string with 2 block &nbsp;BLCK1:#222222 BLCK2:#333333<br />
string with 4 blocks &nbsp;BLCK1:#123456 TEXT:#654321 LINE:#334455 FONT:#214365<br />
<br />
I want to validate such a string line against some basic rule:<br />
.*?:#[0-9a-f]{6}.<br />
<br />
but how can I do this for every block in the string within the regex?
</div>
</div>


Hello,

I have a string of multiple 'blocks' of colors in Hex notation. The number of blocks can vary from 1 to 9. each is separated with one or more spaces.

eg: string with 2 block  BLCK1:#222222 BLCK2:#333333
string with 4 blocks  BLCK1:#123456 TEXT:#654321 LINE:#334455 FONT:#214365

I want to validate such a string line against some basic rule:
.*?:#[0-9a-f]{6}.

but how can I do this for every block in the string within the regex?

Regex problem

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

Perl is a high-level, general-purpose, interpreted, dynamic programming languages with over 25 years of development. Perl 5 runs on over 100 platforms from portables to mainframes and is suitable for both rapid prototyping and large-scale development projects.  Perl gained widespread popularity as a Common Gateway Interface (CGI) scripting language, in part due to its regular expression and string parsing abilities. In addition to CGI, Perl is used for graphics programming, system administration, network programming, finance, bioinformatics, and other applications.