Check if a string has multiple '.' characters
66447
How can I get file extensions with JavaScript?
14800
How do I check if a string contains a specific word?
21337
Determining whether a string has a substring (word)
133549
How can I test if a letter in a string is uppercase or lowercase using JavaScript?
63349
How to string-compare for a single space
120682
How do I verify that a string only contains letters, numbers, underscores and dashes?
31087
How to check if a string contains a substring in Bash
150982
Java String - See if a string contains only numbers and not letters
137733
Checking string has balanced parentheses
52205
How to compare a string against multiple other strings
119001
Check if multiple strings exist in another string
120568
How many characters can a Java String have?
94281
How can I grep for a string containing regex metacharacters like $ and '?
35441
How to tell if a string contains valid Python code
46987
Does Python have a string 'contains' substring method?
1540
Count the number of occurrences of a character in a string in Javascript
128484
How to filter string for unwanted characters using regex?