adding example for regex and evaluation functions

chadsmith12 · May 17, 2018 · 430467d · 430467d
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diff --git a/regex-evaluating functions/app.js b/regex-evaluating functions/app.js
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+/**
+ * Basic example of regular expressions in javascript.
+ * This example shows evaluation functions.
+ */
+
+ // literal expression of 'hello'
+ // each character is a literal character and will be taken at face value.
+ let re = /hello/;
+
+ // exec - Returns result in an array if there is a match, or null if there is no match.
+ // gives you what matches, the index it started matching at, and the input string
+ const result = re.exec('hello world');
+ // this wil give null as there is no match.
+ const result2 = re.exec('hilo');
+
+ console.log(result);
+ console.log(result2);
+
+ // test - Returns true or false
+ // true as hello matches.
+ const testResult = re.test('hello');
+ // can make it case insensitive
+ re = /hello/i;
+ const testResult2 = re.test('Hello');
+ console.log(testResult);
+ console.log(testResult2);
+
+ // g makes the regular expression global
+ re = /hello/g;
+
+ // match - Returns result array or null
+ const str = 'hello there';
+ const matchResult = str.match(re);
+ console.log(matchResult);
+
+ // search - Returns the index of the first match. If not found, returns -1.
+ const str2 = 'hello there';
+ const searchResult = str2.search(re);
+ console.log(searchResult);
+
+ // replace - returns new string with some or all matches of a pattern
+ const replaceStr = 'hello there';
+ const newStr = str.replace(re, 'Hi');
+ console.log(newStr);
diff --git a/regex-evaluating functions/index.html b/regex-evaluating functions/index.html
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+<!DOCTYPE html>
+<html lang="en">
+<head>
+ <meta charset="UTF-8">
+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
+ <meta http-equiv="X-UA-Compatible" content="ie=edge">
+ <title>Regex SandBox</title>
+</head>
+<body>
+
+ <script src="app.js"></script>
+</body>
+</html>