Regex to find group of Regex inside a word

Regex to find group of Regex inside a word

By : student69K
Date : November 21 2020, 03:00 PM
it helps some times So I was trying to make an approach of a String substrings generator with Regex. I had the idea but it was not so clear to me but I finally got an approach. Haven't tested it so much but by now it works and creates all possible substrings (From left to right) for an unknown word of variable size.
It works for C# Regex Engine. Haven't done benchmarking nor calculated complexity (Looks like O(N^2)? ).
code :
    static void CheckWords( String[] words, HashSet<String> valid )
        foreach( var w in words )
            FindWords( w, valid );

        String word = "";
        for( int i = 0; i < words.Length; i++ )
            for( int j = 0; j < words[i].Length; j++ )
                word += words[j][i];

            FindWords( word, valid );
            word = "";

        String word2 = "";
        for( int i = 0, j = 0; i < words.Length; i++, j++ )
            word += words[i][j];
            word2 += words[i][words[i].Length - i - 1];

        FindWords( word, valid );
        FindWords( word2, valid );


    static void FindWords( String word, HashSet<string> valid )
        int len = word.Length;
        //Generate all possible (left to right) substring for String with Length - a [ FOr example, for "MAKE" we can have possible values for "MAKE", "MAK", "MA", "M", "AKE", "KE", "K, "E", "A
        for( int a = 0; a < len; a++ )
            //Find all possible substring with this length { k = 1, k = 2, k = 3, ..., k = word.Length }
            for( int k = 1; k <= word.Length; k++ )
                Match match = new Regex(@"([A-Za-z]{" + k + "}){1}").Match(word);
                //For all found groups, we just care for the first group wich contains the main unrepeated substrings
                for( int i = 0; i < match.Groups.Count - 1; i++ )
                    for( int j = 0; j < match.Groups[i].Captures.Count; j++ ) //Check each permutation for each word with K length. You can Console.Write each value to check it's generated string
                        if( valid.Contains( match.Groups[i].Captures[j].Value ) )
                            Console.WriteLine( match.Groups[i].Captures[j].Value );
            word = word.Substring( 1, word.Length - 1 );
    HashSet<String> words = new HashSet<string>();
    words.Add( "MAKE" );
    words.Add( "MAD" );         
    words.Add( "END" ); 
    words.Add( "MINE" );                

    String[] array = { "MAKE", "IEMY", "NIAH", "ENDN" };

    CheckWords( array, words );

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Python RegEx - How do I form a regex that contains a hyphen inside a word

Python RegEx - How do I form a regex that contains a hyphen inside a word

By : jaggy
Date : March 29 2020, 07:55 AM
I wish did fix the issue. allowed_domains should be just the domain name. You can filter to a specific path by including the start of the URL in the RegEx
code :
class NdtvXoloNewsItem(CrawlSpider):
    name = "ndtvxolonews"
    allowed_domains = ["gadgets.ndtv.com"]
    start_urls = ["http://gadgets.ndtv.com/tags/xolo/articles"]
    rules = [Rule(LinkExtractor(allow=['http://gadgets.ndtv.com/tags/.*/page\-\d+']))]
Regex to Find a Word Inside Curly Braces

Regex to Find a Word Inside Curly Braces

By : JPB
Date : March 29 2020, 07:55 AM
To fix this issue I need a way to search the text using RegEx and find a word thats inside Latex command (which means that it's inside curly braces) , You can try to use this pattern:
code :
    \G(?!\A)  # contiguous to a previous match
  |           # OR
    \\grk{    # first match
[^}]*?        # all that is not a } (non-greedy) until ...
\K            # reset the start of the match at this position
Tarzan        # ... the target word
Regex find values inside of a group

Regex find values inside of a group

By : Jas
Date : March 29 2020, 07:55 AM
Hope this helps I have the following string: , You can use a negative look behind, like this:
code :
RegEx: find multiple appearance of one group within a RegEx with a second group and boundaries

RegEx: find multiple appearance of one group within a RegEx with a second group and boundaries

By : user3297911
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further You can't do it with one regex match operation. You need to first get the year with one capturing group and then capture all text with all month data into Group 2, and then run another regex on Group 2 value only to grab all the month numbers separately.
You may use
code :
var text = "foo for 2019:\n\nmonth value\n    3   101\n    4   202\n    5   303\n\nbar for xyz";
var match = /foo\sfor\s(20\d\d):([^]+?)bar\sfor/.exec(text);
if (match) {
    console.log("Year: ", match[1]);
    var months = match[2].match(/\d+(?=[ \t]+\d)/gm);
    console.log("Months: ", months);
Regex find word inside string

Regex find word inside string

By : Mates
Date : March 29 2020, 07:55 AM
this will help /.name./ The two points indicate, that there is at least one character on each side.
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