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  • regular expression of 0's and 1's

    - by Lopa
    Hello all I got this question which asks me to figure out why is it foolish to write a regular expression for the language that consists of strings of 0's and 1's that are palindromes( they read the same backwards and forwards). part 2 of the question says using any formal mechanism of your choice, show how it is possible to express the language that consists of strings of 0's and 1's that are palindromes?

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  • Perl: Edit hyperlinks in nested tags that aren't on seperate lines

    - by user305801
    I have an interesting problem. I wrote the following perl script to recursively loop through a directory and in all html files for img/script/a tags do the following: Convert the entire url to lowercase Replace spaces and %20 with underscores The script works great except when an image tag in wrapped with an anchor tag. Is there a way to modify the current script to also be able to manipulate the links for nested tags that are not on separate lines? Basically if I have <a href="..."><img src="..."></a> the script will only change the link in the anchor tag but skip the img tag. #!/usr/bin/perl use File::Find; $input="/var/www/tecnew/"; sub process { if (-T and m/.+\.(htm|html)/i) { #print "htm/html: $_\n"; open(FILE,"+<$_") or die "couldn't open file $!\n"; $out = ''; while(<FILE>) { $cur_line = $_; if($cur_line =~ m/<a.*>/i) { print "cur_line (unaltered) $cur_line\n"; $cur_line =~ /(^.* href=\")(.+?)(\".*$)/i; $beg = $1; $link = html_clean($2); $end = $3; $cur_line = $beg.$link.$end; print "cur_line (altered) $cur_line\n"; } if($cur_line =~ m/(<img.*>|<script.*>)/i) { print "cur_line (unaltered) $cur_line\n"; $cur_line =~ /(^.* src=\")(.+?)(\".*$)/i; $beg = $1; $link = html_clean($2); $end = $3; $cur_line = $beg.$link.$end; print "cur_line (altered) $cur_line\n"; } $out .= $cur_line; } seek(FILE, 0, 0) or die "can't seek to start of file: $!"; print FILE $out or die "can't print to file: $1"; truncate(FILE, tell(FILE)) or die "can't truncate file: $!"; close(FILE) or die "can't close file: $!"; } } find(\&process, $input); sub html_clean { my($input_string) = @_; $input_string = lc($input_string); $input_string =~ s/%20|\s/_/g; return $input_string; }

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  • How do you implement a good profanity filter?

    - by Ben Throop
    Many of us need to deal with user input, search queries, and situations where the input text can potentially contain profanity or undesirable language. Oftentimes this needs to be filtered out. Where can one find a good list of swear words in various languages and dialects? Are there APIs available to sources that contain good lists? Or maybe an API that simply says "yes this is clean" or "no this is dirty" with some parameters? What are some good methods for catching folks trying to trick the system, like a$$, azz, or a55? Bonus points if you offer solutions for PHP. :) Edit: Response to answers that say simply avoid the programmatic issue: I think there is a place for this kind of filter when, for instance, a user can use public image search to find pictures that get added to a sensitive community pool. If they can search for "penis", then they will likely get many pictures of, yep. If we don't want pictures of that, then preventing the word as a search term is a good gatekeeper, though admittedly not a foolproof method. Getting the list of words in the first place is the real question. So I'm really referring to a way to figure out of a single token is dirty or not and then simply disallow it. I'd not bother preventing a sentiment like the totally hilarious "long necked giraffe" reference. Nothing you can do there. :)

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  • Building a regexp to split a string

    - by Kivin
    I'm seeking a solution to splitting a string which contains text in the following format: "abcd efgh 'ijklm no pqrs' tuv" which will produce the following results: ['abcd', 'efgh', 'ijklm no pqrs', 'tuv'] In otherwords, it splits by whitespace unless inside of a single quoted string. I think it could be done with .NET regexps using "Lookaround" operators, particularly balancing operators. I'm not so sure about perl.

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  • preg_match , regexp , php , ignore white spaces and new lines

    - by Michael
    I'm trying to extract richard123 using php preg_replace but there are a lot of white spaces and new lines and I think because of that my regexp doesn't work . The html can be seen here : http://pastebin.com/embed_iframe.php?i=vuD3z9ij My current preg_match is : $find = "/< tr bgcolor=\"F0F0F0\" valign=\"middle\">< td align=\"left\">< font size=\"-1\">(.*)<\/font><\/td>/"; preg_match_all($find, $res, $matches2); print_r($matches2); I also tried <\/td/s"; <\/td/m"; <\/td/x"; but doesn't work either .

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  • How to remove a tab attribute in ASP .NET AJAX Toolkit using Regular Expression

    - by Nassign
    I have tried to remove the following tag generated by the AJAX Control toolkit. The scenario is our GUI team used the AJAX control toolkit to make the GUI but I need to move them to normal ASP .NET view tag using MultiView. I want to remove all the __designer: attributes Here is the code <asp:TextBox ID="a" runat="server" __designer:wfdid="w540" /> <asp:DropdownList ID="a" runat="server" __designer:wfdid="w541" /> ..... <asp:DropdownList ID="a" runat="server" __designer:wfdid="w786" /> I tried to use the regular expression find replace in Visual Studio using: Find: :__designer\:wfdid="w{([0-9]+)}" Replace with empty space Can any regular expression expert help?

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  • Backreferences syntax in replacement strings (why dollar sign?)

    - by polygenelubricants
    In Java, and it seems in a few other languages, backreferences in the pattern is preceded by a slash (e.g. \1, \2, \3, etc), but in a replacement string it's preceded by a dollar sign (e.g. $1, $2, $3, and also $0). Here's a snippet to illustrate: System.out.println( "left-right".replaceAll("(.*)-(.*)", "\\2-\\1") // WRONG!!! ); // prints "2-1" System.out.println( "left-right".replaceAll("(.*)-(.*)", "$2-$1") // CORRECT! ); // prints "right-left" System.out.println( "You want million dollar?!?".replaceAll("(\\w*) dollar", "US\\$ $1") ); // prints "You want US$ million?!?" System.out.println( "You want million dollar?!?".replaceAll("(\\w*) dollar", "US$ \\1") ); // throws IllegalArgumentException: Illegal group reference Questions: Is the use of $ for backreferences in replacement strings unique to Java? If not, what language started it? What flavors use it and what don't? Why is this a good idea? Why not stick to the same pattern syntax? Wouldn't that lead to a more cohesive and an easier to learn language? Wouldn't the syntax be more streamlined if statements 1 and 4 in the above were the "correct" ones instead of 2 and 3?

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  • preg_replace Pattern

    - by codeworxx
    Hey Guys, i'm not very firm with preg_replace - in other Words i do not really understand - so i hope you can help me. I have a string in a Text like this one: [demo category=1] and want to replace with the Content of Category (id=1) e.g. "This is the Content of my first Category" This is my startpoint Pattern - that's all i have: '/[demo\s*.*?]/i'; Hope you can help? Thanks, Sascha

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  • regular expression to extract @name symbols from tweet

    - by Joey
    Hello All, I would like to use regular expression to extract only @patrick @michelle from the following sentence: @patrick @michelle we having diner @home tonight do you want to join? Note: @home should not be include in the result because, it is not at beginning of the sentence nor is followed by another @name. Any solution, tip, comments will be really appreciated.

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  • How can I split a string by whitespace unless inside of a single quoted string?

    - by Kivin
    I'm seeking a solution to splitting a string which contains text in the following format: "abcd efgh 'ijklm no pqrs' tuv" which will produce the following results: ['abcd', 'efgh', 'ijklm no pqrs', 'tuv'] In other words, it splits by whitespace unless inside of a single quoted string. I think it could be done with .NET regexps using "Lookaround" operators, particularly balancing operators. I'm not so sure about Perl.

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  • Extract number from string in MSBuild

    - by Ole Lynge
    I would like to extract the number from a string in MSBuild. How can I do that using the built in tasks or the MSBuild.Community.Tasks? (RegexMatch might do, but how?) Example: I have the string agent0076 and I would like to get out the number, without the leading zeros: 76

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  • Python re.IGNORECASE being dynamic

    - by Adam Nelson
    I'd like to do something like this: re.findall(r"(?:(?:\A|\W)" + 'Hello' + r"(?:\Z|\W))", 'hello world',re.I) And have re.I be dynamic, so I can do case-sensitive or insensitive comparisons on the fly. This works but is undocumented: re.findall(r"(?:(?:\A|\W)" + 'Hello' + r"(?:\Z|\W))", 'hello world',1) To set it to sensitive. Is there a Pythonic way to do this? My best thought so far is: if case_sensitive: regex_senstive = 1 else: regex_sensitive = re.I re.findall(r"(?:(?:\A|\W)" + 'Hello' + r"(?:\Z|\W))", 'hello world',regex_sensitive)

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  • jQuery element with multiple classes: storing one class as a var

    - by Aaron
    I'm trying to create a standardized show/hide element system, like so: <div class="opener popup_1">Click Me</div> <div class="popup popup_1">I'm usually hidden</div> Clicking on the div with the opener class should show() the div with the popup class. I don't know how many opener/popup combinations I'm going to have on any given page, I don't know where on any given page the opener and the popup are going to be displayed, and I don't know how many popups a given opener should call show() for. Both the opener and the popup have to be able to have more classes than just what's used by jQuery. What I'd like to do is something like this: $(".opener").click(function() { var openerTarget = $(this).attr("class").filter(function() { return this.class.match(/^popup_([a-zA-Z0-9-_\+]*) ?$/); }); $(".popup." + openerTarget).show(); The idea is that when you click on an opener, it filters out "popup_whatever" from opener's classes and stores that as openerTarget. Then anything with class=popup and openerTarget will be shown.

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  • regular expression help

    - by JPro
    I always get confused using regular expressions. Can anyone please suggest me a tutorial? I need help with checking for a string which, cannot contain any wild characters except colon, comma, full stop. It will be better to replace these if found. Any help? Thanks.

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  • Regular Expression help

    - by user104628
    hi everyone. I can't seem to make my regular expression work. I'd like to have some alpha text, no numbers, an underscore and then some more aplha text. for example: blah_blah I have an non-working example here ^[a-z][_][a-z]$ Thanks in advance people. EDIT: I applogize, I'd like to enforce the use of all lower case.

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  • Need help with using regular expression in Java

    - by richard
    Hi, I am trying to match pattern like '@(a-zA-Z0-9)+ " but not like 'abc@test'. So this is what I tried: Pattern MY_PATTERN = Pattern.compile("\\s@(\\w)+\\s?"); String data = "[email protected] #gogasig @jytaz @tibuage"; Matcher m = MY_PATTERN.matcher(data); StringBuffer sb = new StringBuffer(); boolean result = m.find(); while(result) { System.out.println (" group " + m.group()); result = m.find(); } But I can only see '@jytaz', but not @tibuage. How can I fix my problem? Thank you.

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  • ack (perl?) regexp matching lines where if is the first word

    - by Gauthier
    Hey. I'm finally learning regexps, training with ack. I believe this uses perl regexp. I want to match all lines where the first non-blank characters are if (<word> !, with any number of spaces in between the elements. This is what I came up with: ^[ \t]*if *\(\w+ *! It only nearly worked. ^[ \t]* is wrong, since it matches one or none [space or tab]. What I want is to match anything that may contain only space or tab (or nothing). For example these should not match: // if (asdf != 0) else if (asdf != 1) How can I modify my regexp for that?

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  • how to check whether for each value in array is a numeric, alphabetical or alphanumeric (Perl)

    - by dexter
    i have array which values are user input like: aa df rrr5 4323 54 hjy 10 gj @fgf %d would be that array, now i want to check each value in array whether its numeric or alphabetic (a-zA-Z) or alphanumeric and save them in other respective arrays i have done: my @num; my @char; my @alphanum; my $str =<>; my @temp = split(" ",$str); foreach (@temp) { print "input : $_ \n"; if ($_ =~/^(\d+\.?\d*|\.\d+)$/) { push(@num,$_); } } this works, similarly i want to check for alphabet, and alphanumeric values note: alphanumeric ex. fr43 6t$ $eed5 *jh

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