Mega Code Archive

Complete list of regular expression examples

Expression Will match . . . foo The string "foo" ^foo "foo" at the start of a line foo$ "foo" at the end of a line ^foo$ "foo" when it is alone on a line [Ff]oo "Foo" or "foo" [abc] a, b, or c [^abc] d, e, f, g, V, %, ~, 5, etc.everything that is not a, b, or c (^ is "not" inside character classes) [A-Z] Any uppercase letter [a-z] Any lowercase letter [A-Za-z] Any letter [A-Za-z0-9] Any letter or number [A-Z]+ One or more uppercase letters [A-Z]* Zero or more uppercase letters [A-Z]? Zero or one uppercase letters [A-Z]{3} Three uppercase letters [A-Z]{3,} A minimum of three uppercase letters [A-Z]{1,3} One, two, or three uppercase letters [^0-9] Any non-numeric character [^0-9A-Za-z] Any symbol (not a number or a letter) (cat|sat) Matches either "cat" or "sat" ([A-Z]{3}|[0-9]{4}) Matches three letters or four numbers Fo* F, Fo, Foo, Fooo, Foooo, etc. Fo+ Fo, Foo, Fooo, Foooo, etc. Fo? F, Fo . Any character except \n (new line) \b A word boundary; e.g. te\b matches the "te" in "late" but not the "te" in "tell." \B A non-word boundary; "te\B" matches the "te" in "tell" but not the "te" in "late." \n Newline character \s Any whitespace (new line, space, tab, etc.) \S Any non-whitespace character