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Line 15: ==Regular Expressions== The [[regexp]] syntax forms a ___domain-specific 5GL. Rather than defining an algorithm, the programmer specifies, by means of specialized syntax, a pattern to match text against (i.e., constraints). The regex pattern is compiled and run against text, returning the token(s) desired by the programmer. ~~visual basic~~ Regular expressions exist in Perl, Python, Java, .NET, PHP, ~~sed~~SED, ~~awk~~AWK, C and ECMAScript. The difficulty level and repetitive nature of searching text and returning desired tokens makes regular expressions one of the few ubiquitous examples of a 5GL (___domain-specific though it is). ==See also==

Fifth-generation programming language: Difference between revisions