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Case-insensitive regexes tend to be messy. &nbsp;In such situations (and especially when more than one comparison will be done) it is simpler both in terms of computation and regex readability to convert the input to lowercase before attempting the match.
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Case-insensitive regexes tend to be messy.  In such situations (and especially when more than one comparison will be done) it is simpler both in terms of computation and regex readability to convert the input to lowercase before attempting the match.

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i dont know how to write it <br />
could you please give ne an exmple regarding me question<br />
thanks
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i dont know how to write it
could you please give ne an exmple regarding me question
thanks

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Just add the RegEx to match case insensitive (/i). This depends on where you use the RegEx<br />
<a href="https://regex101.com/r/NXUhiF/1" rel="ugc">https://regex101.com/r/NXUhiF/1</a>
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Just add the RegEx to match case insensitive (/i). This depends on where you use the RegEx
https://regex101.com/r/NXUhiF/1 [https://regex101.com/r/NXUhiF/1]

Amin El-Zein

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Hello,<br />
how I can &nbsp;create a regular exp for :<br />
c:\windows but without match the letter case.<br />
thanks.
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Hello,
how I can  create a regular exp for :
c:\windows but without match the letter case.
thanks.

regexp later case

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.