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Hi Experts,<br />
<br />
I have a list of string and I want to find the strings that does not contain a substring.<br />
<br />
for example,<br />
<br />
string123.opt.userID<br />
string1234.userID<br />
string12345.opt.userID<br />
string12.userID<br />
<br />
I want to get a list of items that does not have the strings with .opt.<br />
So, my list would be string1234.userID, string12.userID<br />
<br />
I just need a regular expression that can provide it. &nbsp;thanks.
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Hi Experts,

I have a list of string and I want to find the strings that does not contain a substring.

for example,

string123.opt.userID
string1234.userID
string12345.opt.userID
string12.userID

I want to get a list of items that does not have the strings with .opt.
So, my list would be string1234.userID, string12.userID

I just need a regular expression that can provide it.  thanks.

Regular Expression to filter string

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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

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