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Added Introduction section of regex in Python
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‎GeeksForGeeks/Interview Prep Course/Arrays/Count Smaller Elements.java

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import java.util.*;
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import java.lang.*;
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import java.io.*;
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import static java.lang.System.out;
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class GFG {
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public static void main (String[] args) throws Exception {
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BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
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int t = Integer.parseInt(br.readLine());
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while (t-- > 0) {
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int n = Integer.parseInt(br.readLine());
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String[] s = br.readLine().split("\\s+");
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int[] arr = new int[n];
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for (int i=0; i<s.length; i++) {
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arr[i] = Integer.parseInt(s[i]);
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}
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// Solution here
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int[] ans = new int[n];
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for (int i=0; i<n; i++) {
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int number = arr[i];
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int count = 0;
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for (int j=i+1; j<n; j++) {
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if (arr[j] < number) {
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count++;
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}
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}
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ans[i] = count;
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}
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for (int num : ans) {
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out.print(num + " ");
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}
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out.println();
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}
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}
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}

‎GeeksForGeeks/Interview Prep Course/Arrays/Majority Element.java

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import java.util.*;
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import java.lang.*;
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import java.io.*;
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import static java.lang.System.out;
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class GFG {
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public static void main (String[] args) throws Exception {
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BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
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int t = Integer.parseInt(br.readLine());
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while (t-- > 0) {
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int n = Integer.parseInt(br.readLine());
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String[] s = br.readLine().split("\\s+");
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Map<Integer, Integer> map = new HashMap<>();
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int limit = n/2;
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int ans = -1;
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for (int i=0; i<s.length; i++) {
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int key = Integer.parseInt(s[i]);
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map.put(key, map.getOrDefault(key, 0) + 1);
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if (map.get(key) > limit) {
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ans = key;
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break;
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}
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}
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out.println(ans);
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}
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}
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}

‎Hackerrank/Regex/Introduction/Matching Specificc String.java renamed to ‎Hackerrank/Regex/Introduction/Java/Matching Specificc String.java

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‎Hackerrank/Regex/Introduction/Matching anything but a newline.java renamed to ‎Hackerrank/Regex/Introduction/Java/Matching anything but a newline.java

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‎Hackerrank/Regex/Introduction/Matching digits non-digit character.java renamed to ‎Hackerrank/Regex/Introduction/Java/Matching digits non-digit character.java

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‎Hackerrank/Regex/Introduction/Matching start end.java renamed to ‎Hackerrank/Regex/Introduction/Java/Matching start end.java

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‎Hackerrank/Regex/Introduction/Matching whitespace non-whitespace character.java renamed to ‎Hackerrank/Regex/Introduction/Java/Matching whitespace non-whitespace character.java

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‎Hackerrank/Regex/Introduction/Matching word non-word.java renamed to ‎Hackerrank/Regex/Introduction/Java/Matching word non-word.java

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‎Hackerrank/Regex/Introduction/Python/Matching Anything But a Newline.py

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regex_pattern = r"^...\....\....\....$" # Do not delete 'r'.
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import re
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import sys
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test_string = input()
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match = re.match(regex_pattern, test_string) is not None
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print(str(match).lower())

‎Hackerrank/Regex/Introduction/Python/Matching Digits & Non-Digit Characters.py

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Regex_Pattern = r"\d\d\D\d\d\D\d\d\d\d" # Do not delete 'r'.
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import re
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print(str(bool(re.search(Regex_Pattern, input()))).lower())

‎Hackerrank/Regex/Introduction/Python/Matching Specific String.py

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Regex_Pattern = r'hackerrank' # Do not delete 'r'.
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import re
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Test_String = input()
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match = re.findall(Regex_Pattern, Test_String)
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print("Number of matches :", len(match))

‎Hackerrank/Regex/Introduction/Python/Matching Start & End.py

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Regex_Pattern = r"^\d\w\w\w\w\.$" # Do not delete 'r'.
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import re
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print(str(bool(re.search(Regex_Pattern, input()))).lower())

‎Hackerrank/Regex/Introduction/Python/Matching Whitespace & Non-Whitespace Character.py

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Regex_Pattern = r"\S\S\s\S\S\s\S\S" # Do not delete 'r'.
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import re
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print(str(bool(re.search(Regex_Pattern, input()))).lower())

‎Hackerrank/Regex/Introduction/Python/Matching Word & Non-Word Character.py

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Regex_Pattern = r"\w\w\w\W\w\w\w\w\w\w\w\w\w\w\W\w\w\w" # Do not delete 'r'.
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import re
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print(str(bool(re.search(Regex_Pattern, input()))).lower())

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