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In telecommunications, a wildcard character is a
character that may be substituted for any of a defined subset of all possible characters.In computer ( software) technology, a wildcard character can be used to substitute for any other character or characters in a string.
The asterisk (*) usually substitutes as a wildcard character for any zero or more characters, and the question mark (?) usually substitutes as a wildcard character for any one character, as in the CP/M, DOS, Microsoft Windows and POSIX ( Unix) shells. (In Unix this is referred to as glob expansion.) In SQLStructured Query Language SQL is the most popular computer language used to create, modify and query databases. Technically, SQL is a declarative computer language for use with "quasi- relational databases". Theorists note that many of the original SQL fe, the wildcard characters are percentA percentage is a way of expressing a proportion or a fraction as a whole number. A number such as "45%" ("45 percent" or "45 per cent") is actually shorthand for the fraction 45/100. In British English, percent is often written as two words per cent , an (%) for zero or more characters, and underscoreThe underscore _ is the character with ASCII value 95. On the standard US 101/102 computer keyboard it shares a key with the hyphen on the top row, to the right of the 0 key. It is used as a diacritic mark in some African and Native American languages. (_) for one character. In many regular expressionA regular expression (abbreviated as regexp regex or by some regxp is a string that describes a whole set of strings, according to certain syntax rules. These expressions are used by many text editors and utilities (especially in the Unix operating system implementations, the periodA full stop or period also called a full point is the punctuation mark commonly placed at the end of several different types of sentences in English and several other languages. A period consists of a small dot placed at the end of a line of text, thus: " (.) is the wildcard character for a single character.
Source: originally from Federal Standard 1037CFederal Standard 1037C entitled Telecommunications: Glossary of Telecommunication Terms is a U. Federal Standard, issued by the General Services Administration pursuant to the Federal Property and Administrative Services Act of 1949, as amended. This docu and from MIL-STD-188MIL-STD-188 is a series of U. military standards relating to telecommunications. Documents 100 Common Long Haul and Tactical Communication System Technical Standards. 105 Interoperability and Performance Standards for the All Digital Tactical-To-Strategic