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

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<!DOCTYPE html>
<htmllang="en">
<head>
<metacharset="UTF-8">
<title>demo</title>
</head>
<body>
<pid="demo"></p>

<preid="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>
<preid="preTxt2"></pre>

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

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

vartxt2='Use\n a Case insensitive regular\n case to replace Microsoft with W3Schools in a string:'
//alert(txt2);
vartxtSr2=txt2.search(/case/i);
//var txtRp = txtSr2.replace('Johnyt')
vartxtRp=txt2.replace(/Case/ig,'John');
document.getElementById('demo').innerHTML=txtRp;

vartxt3=document.getElementById('preTxt').innerHTML;
vartxtRp2=txt3.replace(/expression/ig,'John');
document.getElementById('preTxt2').innerHTML=txtRp2;

varptrTxt='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');
varptRs=ptrTxt.replace(/(x|y)/,'BNT')
document.getElementById('demo2').innerHTML=ptRs;

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

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

varx='It searches a string For a pattern, and returns true or false, depending on the result.'
vary=/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>