How to find out the duplicate characters in a string?
2085
How would you count occurrences of a string (actually a char) within a string?
62998
How to match multiple copies of a value?
153235
Checking for duplicates in sublists
100635
Find the first un-repeated character in a string
12835
How to efficiently find positions of duplicates?
73532
How to compare ends of strings in C?
103477
How can I find repeated letters with a Perl regex?
93787
Find duplicate files
11398
How do I count the number of occurrences of a char in a String?
58046
How to check whether a string contains a substring in JavaScript?
135836
How to count of sub-string occurrences?
107014
Replacing multiple characters in a string, the fastest way?
52400
How to remove the last character from a string?
29864
String comparison technique used by Python
61465
Java Remove Duplicates from an Array?
9751
How to remove duplicate values from an array in PHP
65270
How do I perform string matching and replacements?