JavaScript: check if a giving string contains only letters or digits
45636
RegEx for Javascript to allow only alphanumeric
41132
String contains any items in an array (case insensitive)
110890
How to prevent non-alphanumeric input in javascript?
108395
How to use regex in String.contains() method in Java
106258
What is the reason that an empty string evaluates to false in Javascript
17134
Checking if first letter of string is in uppercase
32239
contains method of String is not working properly
124479
Check if a String contains a special character
86808
How to determine if a string is a valid variable name?
47715
How to check if the URL contains a given string?
92414
RegEx to make sure that the string contains at least one lower case char, upper case char, digit and symbol
21337
Determining whether a string has a substring (word)
110451
How to check if a string is numeric?
43927
How to check that a string is a palindrome using regular expressions?
478
How to determine if string contains specific substring within the first X characters
148755
How to check if string contents have any HTML in it?
87552
How to test if a string is basically an integer in quotes using Ruby