Validating Strings as Half width Katakana Using Regex in JavaScript
To check if a string consists of half-width Katakana characters using regular expressions, use the pattern ^[ｦ-ﾟ]+$ This regex means "a string composed of one or more half-width Katakana characters."
Validating Strings as Numeric Using Regex in JavaScript
To check if a string consists of half-width digits using regular expressions, use the pattern ^[0-9]+$ This regex means "a string composed of one or more digits from 0 to 9." It matches strings like "001," "9," and "12345."
Validating Strings as Alphanumeric Symbols Using Regex in JavaScript
To check if a string contains only alphanumeric symbols using regular expressions, use ^[ -~]+$ . This pattern matches strings composed of one or more alphanumeric symbols, such as "Hello, world!".
Validating Strings as Alphanumeric Using Regex in JavaScript
To validate alphanumeric characters using regular expressions, use ^[a-zA-Z0-9]+$. This pattern matches strings composed of one or more alphanumeric characters, such as "3DModel".
Retrieve a substring from the end in JavaScript
To extract a substring from the end of a string in JavaScript, you can use a regular expression to get the characters starting from the position which is the length of the string minus the length of the desired substring.
