aquabad.blogg.se

Let rexp = TestStr.match(alphabetRegexp) Ĭonsole.log(rexp) // Match Letters of the Alphabet: let TestStr = "Pack my box with five dozen liquor jugs." Match Single Character with Multiple Possibilities: let TestStr = "The quick brown fox jumps over the lazy dog." Ĭonsole.log(rexp) //

Match Anything with Wildcard Period: let TextStr = "The final phases of the war!" Let IgCaseRegexp = /JavaScriptTutorial/i Įxtract Matches: let TextStr = "Extract the 'zip' from this file." įind More Than the First Match: let TextStr = "The quick brown fox jumps over the lazy dog" Ignore Case While Matching: let TextStr = "JavaScriptTutorial" Match a Literal String with Different Possibilities: let TextStr = "Cow is domestic animal." Match Literal Strings: let TextStr = "The quick brown fox jumps over the lazy dog." Using the Test Method: let TextStr = "The quick brown fox jumps over the lazy dog." Complete list and description of the special pattern matching characters.For example, the pattern /xy*z/ matches any character.įor example, /bo*/ matches 'boo' in "A book" and 'b' in "A beautiful river", but nothing in "A going concern". Sometimes various pattern matching is required instead of direct matching. Using the constructor function, as follows : In the above notation, the forward slash character (/) is used to designate the starting and end of the pattern. The above code creates a new RegExp object called colorName and assigns the pattern Green. There are two ways to construct a regular expression. In JavaScript, regular expressions are also objects. into a HTML form field to get a valid format. Sometimes regular expressions are used to check an email, password, name etc. You can also substitute the word "red" with "green". A regular expression (sometimes abbreviated to "regex") is a pattern used to match character combinations in a string.įor example, a regular expression can be used to search for all text lines in a paragraph that contain word "red" and display those lines where the match is found.