JavaScriptPractice/rg_exp.html at main · EduKeyPath/JavaScriptPractice · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>demo</title>
</head>
<body>
<p id="demo"></p>

<pre id="preTxt">
Regular expression arguments (instead of string arguments)
can be used expression the methods above.
Regular expression can make your search much more
powerful (case insensitive for Expression).
</pre>
<pre id="preTxt2"></pre>

<p id="demo2"></p>
<p id="demo3"></p>
<p id="demo4"></p>
<p id="demo5"></p>

<script>
    var txt = "Regular Expressions can be used to perform all types of text search and Text replace operations."
    var txtSr = txt.search(/expressions/i);
    document.getElementById('demo').innerHTML = txtSr;

    var txt2 = 'Use\n a Case insensitive regular\n case to replace Microsoft with W3Schools in a string:'
    //alert(txt2);
    var txtSr2 = txt2.search(/case/i);
    //var txtRp = txtSr2.replace('Johnyt')
    var txtRp = txt2.replace(/Case/ig, 'John');
    document.getElementById('demo').innerHTML = txtRp;

    var txt3 = document.getElementById('preTxt').innerHTML;
    var txtRp2 = txt3.replace(/expression/ig, 'John');
    document.getElementById('preTxt2').innerHTML = txtRp2;

    var ptrTxt = 'In Ypou JavaScript, the 2011 RegExp object is a 1520 regular';
    //var ptrSr = /[r]/ig;
    //var ptRs = ptrTxt.match(ptrSr);
    //var ptRs = ptrTxt.replace(/[a]/ig, 'John');
    //var ptRs = ptrTxt.replace(/[1]/ig, '99');
    var ptRs = ptrTxt.replace(/(x|y)/, 'BNT')
    document.getElementById('demo2').innerHTML = ptRs;

    var mTchr = 'Metacharacters are characters with are special meaning';
    var mtchF = mTchr.replace(/a*/, 'BB');
    document.getElementById('demo3').innerHTML = mtchF;

    var mTstr = 'In JavaScript, the RegExp object is a regular expression';
    var mT = /J/;
    document.getElementById('demo4').innerHTML = mT.test(mTstr);

    var x = 'It searches a string For a pattern, and returns true or false, depending on the result.'
    var y = /for/i;
    document.getElementById('demo5').innerHTML = y.exec(x);
    //document.getElementById('demo5').innerHTML = y.test(x);
    //document.getElementById('demo5').innerHTML = /fdfgdg/.test(x);
</script>


</body>
</html>