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I would like to know how to write a regex which does not allow strings ending with dev, qa, prd, staging and the string should be only lowercase.<br />
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for example <br />
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abcqa not allowed<br />
xyzdev not allowed<br />
pqr allowed<br />
abcdef - allowed<br />
mnxpkdev - not allowed<br />
lmnopstaging - not allowed
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I would like to know how to write a regex which does not allow strings ending with dev, qa, prd, staging and the string should be only lowercase.

for example 

abcqa not allowed
xyzdev not allowed
pqr allowed
abcdef - allowed
mnxpkdev - not allowed
lmnopstaging - not allowed

regex to restrict strings ending with something

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.