recursive-regex

I want to match regexes (at least the basic ones, not all their possible kinds... for now...) in a text of Ruby script. It's something like a... \/\^? oh my god... \$?\/[eimnosux]* Maybe I need recursive regex here. As I commented above, you'll need to parse Ruby to differentiate division slashes and regex delimiters. But for the simplest, SIMPLEST case without worrying about this, how about: regex_match = %r{/(?:[^/\\]|\\.)+/[mgixo]*} That is "A forward slash, followed by one or more things that either aren't a forward slash or a backslash, or are a backslash followed by something else,

Lets say I have following string: "<aa v={<dd>sop</dd>} z={ <bb y={ <cc x={st}>ABC</cc> }></bb> }></aa>" How can I write general purpose regex (tag names change, attribute names change) to match content inside {} , either <dd>sop</dd> or <bb y={ <cc x={st}>ABC</cc> }></bb> . Regex I wrote "(\s*\w*=\s*\{)\s*(<.*>)\s*(\})" matches "<dd>sop</dd>} z={ <bb y={ <cc x={st}>ABC</cc> }></bb>" which is not correct. In generic regex there's no way to handle nesting in a good way. Hence all the wining when a question like this comes up - never use regex to parse XML/HTML. In some simple cases it might be

After reading polygenelubricants 's series of articles on advanced regular expressions techniques (particularly How does this Java regex detect palindromes? ), I decided to attempt to create my own PCRE regex to parse a palindrome, using recursion (in PHP). What I came up with was: ^(([a-z])(?1)\2|[a-z]?)$ My understanding of this expression is that it should either match zero or one characters (every string of less than 2 characters is implicitly a palindrome, as well as to account for palindromes with odd lengths in the recursion), or two of the same character separated by a recursion of the

I am imagining a function which I figure would use Regex, and it would be recursive for instances like <p><strong></strong></p> to remove all empty HTML tags within a string. This would have to account for whitespace to if possible. There would be no crazy instances where < character was being used in an attribute value. I am pretty terrible at regex but I imagine this is possible. How can you do it? Here is the method I have so far: Public Shared Function stripEmptyHtmlTags(ByVal html As String) As String Dim newHtml As String = Regex.Replace(html, "/(<.+?>\s*</.+?>)/Usi", "") If html <>

I would like to match text enclosed in brackets etc in Perl. How can I do that? This is a question from the official perlfaq . We're importing the perlfaq to Stack Overflow . This is the official FAQ answer minus any subsequent edits. Your first try should probably be the Text::Balanced module, which is in the Perl standard library since Perl 5.8. It has a variety of functions to deal with tricky text. The Regexp::Common module can also help by providing canned patterns you can use. As of Perl 5.10, you can match balanced text with regular expressions using recursive patterns. Before Perl 5.10