Regular Expression Patterns

From various sources I have collected the following regular expression patterns. They helped me a lot in front-end and back-end validation.

Alpha:

Pattern: ^[a-zA-Z_ ]+$
Description: Allows only ‘A-Z’, ‘a-z’, space ( ‘ ‘ ) and underscore ( ‘_’).

Alphanumeric:

Pattern: ^[a-zA-Z0-9_ ]+$
Description: Allows only ‘A-Z’, ‘a-z’, ‘0-9’, space ( ‘ ‘ ) and underscore ( ‘_’).

Email:

Pattern: /^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i

Numeric:

Pattern: ^\d+$

Decimal:

Pattern: ^\d+(?:\.\d{0,2})?$

Date – 1:

Pattern: ^(0[1-9]|[1,2][0-9]|3[0-1])-(0[1-9]|1[0,1,2])-\d{4}$
Description: Date format DD-MM-YYYY

Date – 2:

Pattern: ^(0[1-9]|1[0,1,2])-(0[1-9]|[1,2][0-9]|3[0-1])-\d{4}$
Description: Date format MM-DD-YYYY

US Zip Code:

Pattern: ^\d{5}$

US Telephone Number:

Pattern: ^1?[\-]?\(?\d{3}\)?[\-]?\d{3}[\-]?\d{4}$

Color Code:

Pattern: ^#{1}?([a-f]|[A-F]|[0-9]){3}(([a-f]|[A-F]|[0-9]){3})?$

Any HTML Tag:

Pattern: <([^">]+(?:”[^”]+”)*[^>]+)>