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In other languages, the regular expression can possibly be compiled on-the-fly, but the internal structure (a kind of finite automaton) is always built first. In other words, you will always be notified somehow if the syntax is bad.
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In other languages, the regular expression can possibly be compiled on-the-fly, but the internal structure (a kind of finite automaton) is always built first. In other words, you will always be notified somehow if the syntax is bad.

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Hi All,<br />
<br />
Im doing filtering the files/folders path. i use boost library to filter the given files/folders path. im using the Boost::Regex_Search() function for this. My question is how to validate the given regular expression is valid one. for example '^' is valid one. but if somebody giving the wrong one like &quot;))))((()(()()&quot;. i need to validate this and give a alert to user that you are giving the wrog regular expression. i searched in Boost documentation and found regex_error_types. but im bit of confusing in that. is it possible to validate regular expressions using PHP or AJAX or Java script.<br />
<br />
Please avoid ereg() functions. <br />
<br />
Thanks in Advance...<br />
<br />
- Prince
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Hi All,

Im doing filtering the files/folders path. i use boost library to filter the given files/folders path. im using the Boost::Regex_Search() function for this. My question is how to validate the given regular expression is valid one. for example '^' is valid one. but if somebody giving the wrong one like "))))((()(()()". i need to validate this and give a alert to user that you are giving the wrog regular expression. i searched in Boost documentation and found regex_error_types. but im bit of confusing in that. is it possible to validate regular expressions using PHP or AJAX or Java script.

Please avoid ereg() functions. 

Thanks in Advance...

- Prince

How to validate the given boost regular expression

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

C++ is an intermediate-level general-purpose programming language, not to be confused with C or C#. It was developed as a set of extensions to the C programming language to improve type-safety and add support for automatic resource management, object-orientation, generic programming, and exception handling, among other features.