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In programming, a regular expression is an expression that explains a pattern for a string. A string matches a regular expression if that string follows the pattern of that re…gular expression. For example, you may want to create an account system, allowing usernames to only have uppercase and lowercase letters, and numbers. While a user is registering, you can check their desired username against a regular expression involving only alphanumeric characters (A-Z, a-z, 0-9). If it matches, then the username is valid to your requests. If it does not, the user has put in a character that does not follow the pattern of the regular expression. In regular expressions, you can match certain characters, match a certain quanity of characters, match the casing of characters (or just ignore it overall), and plenty more. The syntax of a regular expression varies throughout every programming language, but Perl is often used due to its wide variety of options. Perl is also incorporated into many web languages, such as PHP, making regular expressions less of a hassle. This is an example of a Perl regular expression, allowing a string with only alphanumeric characters (any character case), and an infinite length (except for a string with no length or no characters, in which the regular expression does not match the string): /^(?i)[a-z0-9]+$/ (MORE)

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In Geometry

A regular quadrilateral is a a four sided shape that has all of its sides equal in length. There are two shapes that satisfy these conditions, a square and a rhombus.

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In Geometry

A shape where all the sides are equal and all the angles are equal. If all sides are equal but angles or not, it is equilateral. If it is vice versa, it is equiangular.

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In Geometry

It is a 6 sided polygon with 6 equal sides and 6 equal interior angles

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The terms for fractions are common, improper and mixed numeral. Common fractions have a numerator that is smaller than the denominator. Improper fractions have a g…reater numerator than denominator. Mixed numeral has a whole number next to a common fraction. (MORE)

Are you a true gent or do your manners need some work?… (MORE)

Should you spend the night with Casanova or Romeo? Were you and Adam the original sin, or are you Orpheus's muse? Take this quiz and find out!… (MORE)

Do you 'Stay Gold, Pony Boy (or girl),' or are you as disingenuine as a Bret Easton Ellis novel. Find out here.… (MORE)

Through a series of lifestyle and personality questions we will determine definitively what you should be cruising around in… (MORE)

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In Geometry

A regular pyramid is a three-dimensional solid object with only one base (as opposed to prisms, which have two). "Regular" refers to whatever polygon the base is -- it will ha…ve sides of equal length and all of its interior angles will be congruent. The other faces of the regular pyramid are triangles of equal sides (congruent), each sharing two sides with the adjacent faces. Pyramids have 1/3 of the volume of a prisms with the same base and height. (MORE)

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A veto is the constitutional procedure by which the President (or chief legislator of a state) refuses to approve a bill or joint resolution, and thus prevents its enactment i…nto law. A regular veto occurs when the President returns the legislation to the originating House without approval. It can be overridden only by a two-thirds vote in each House. A pocket veto occurs when the President (or state governor) puts aside a bill and doesn't sign it for 10 days, and the Congress adjourns during that time. Since Congress has adjourned, it is unable to override this action and must begin the entire legislative process again. From 1996-1998, the President, like many state governors, had the right to choose to disapprove only particular items of a bill without having to disapprove the entire bill, which is called a line-item veto. It was declared unconstitutional by the US Supreme Court in 1998, and the President no longer has the power of the line-item veto, thought state governors continue to have the right. (MORE)

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In Health

It could be several things going on hormonally. The most common reason for irregular cycles is being a teenager - your body is just not finished growing, and the hormones …are fluctuating. You could also have low hormone levels or high hormone levels or be menopausal or even have cancer in the worst case - if you're not a teenager, you should let your doctor figure out why your periods are irregular. (MORE)

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In Physics

Regular reflection means the incident rays parallel to each other fall on plane or smooth surface and reflects back equal to the angle of incidence is called regular reflectio…n. (MORE)

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In Poetry

A poem with a regular meter is one that contains only one form of meter, be it iambic, trochaic, anapestic, or dactylic. Most poems in the English language contain irregul…ar meter, mixing these different rhythms. (MORE)