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JavaScript - Regular Expressions!!!
Can someone please explain the following code to me!? I don't get regular expressions and how they work :S
Code: function trim(string){
return string.replace(/^\s*/, "").replace(/\s*$/, "");
}
Thanks! Similar TutorialsHow can I get price from a string using regular expression ? Or by any other means . Let's say. var str="Our shop receives only $. This shoe costs $200. We don't accept anything else then $"; How could I retrieve '$200' from this above string. By any means. Thank you... Hello. So I have been doing some regex in php. In Javascript i need to parse a url and replace ALL the & with \/%26 (or what ever that one is) and replace ALL the + with the % thingy. But my problem is I am doing url.replace(/&/,'\/%26') but what is happening is it is replace only the FIRST &. How can I do it to replace ALL &? I was thinking of doing some type of loop but for some reason nothing is working...THANKS IN ADVANCE! Hi everyone, I am trying to validate a date by using regular expressions. I have parts working, such as only accepts numbers, but I cannot get the range correct. On the "mm" field, I am getting errors. Code: if(form.mm.value=="")
{
alert("Please insert your birth month");
return false;}
var re=/^(0[1-9]|1[0-2]){2}$/;
if(!re.test(form.mm.value))
{
alert("Please fix birth month!");
return false;
}
{
if(form.dd.value=="")
{
alert("Please insert your birth day");
return false;}
var re=/^\d{2}$/;
if(!re.test(form.dd.value))
{
alert("Please fix birth day!");
return false;
}
{
if(form.yyyy.value=="")
{
alert("Please insert your birth year");
return false;}
var re=/^\d{4}$/;
if(!re.test(form.yyyy.value))
{
alert("Please fix birth year!");
return false;
Any suggestions will be greatly appreciated. Dear Experts I have folloiwng codes Code: <html>
<head>
<body>
<center>
<script language="JavaScript">
function checkpostal(){
var re=/^\D{A-Z}$/
if (myform.myinput.value.search(re)==-1)
{
alert("Good")
}else{
alert("Bad")
}
}
</script>
<form name="myform">
<input type="text" name="myinput" size=15>
<input type="button" onClick="checkpostal()" value="check">
</form>
</center>
</body>
</html>
With Onclick, I want to test input through regular expression If entered values is between a-z or A-Z then it must display alert("Good") else alert("Bad") Please help Hi All I need help with javascript regular expressions. I have a text box in which user can enter only 4 types of values. 1) Varchar(n) where 0 < n <=80. Ex: Varchar(20) (Varchar(n) . 0< n<= 80 means he can enter values onlly like varchar(1) or varchar(2) ..... varchar(80) ) 2) Char(n) where 0 < n <=80. Ex: Char(20) 3) numeric(x,y) where x>y and 1<= x <=35 and 0<= y <=15. Ex: numeric(20,6) If the text box value doesnot match this pattern, we should throw him alert message. Thanks in Advance Hey everyone I am trying to match an email string that ends exactly with ".com". Here's what I have Code: var email = window.prompt("Enter your email", "");
var email_match = /[a-zA-Z1-9-_.]{3,}\@[a-zA-Z]{3,}\.(com)/
if (email_match.test(email))
alert("Email is Valid");
else
alert("Email Invalid!");
the (com) also matches commm for some odd reason. What must I change in the code so that only emails ending with .com is valid? Thanks! Hi, i'm new to javascript, im managing to find out how to do most things, but i need to validate two paths. I want to know how to check whether path1 is a subpath of path2. e.g. 1: /files/stuff/mypics/anotherfolder/etc 2:/files/stuff/mypics i want to be able to return a boolean given whether i can move folder 1 in to folder 2 in this case yes. but if you swap them its a no. please help. oxide Hi I've got two examples of using regular expressions one works and the other doesn't but they using exactly the same pattern and the same text only difference is - The example that works uses a form to get the patern and text, the other has the pattern hard coded. Any help will be greatly appreciated Works - Code: <html>
<head>
<title></title>
<style type="text/css">
</style>
<script type="text/javascript">
<!--
function frmTestClick() {
var re = new RegExp(document.frmTest.regex.value,"gi");
if (document.frmTest.subject.value.match(re)) {
alert("Successful match");
} else {
alert("No match");
}
}
function demoShowMatchClick() {
var re = new RegExp(document.frmTest.regex.value,"gi");
var m = re.exec(document.frmTest.subject.value);
if (m == null) {
alert("No match");
} else {
var s = "Match at position " + m.index + ":\n";
for (i = 0; i < m.length; i++) {
s = s + m[i] + "\n";
}
alert(s);
}
}
function demoReplaceClick() {
var re = new RegExp(document.frmTest.regex.value, "gi");
document.frmTest.result.value =
document.frmTest.subject.value.replace(re,
document.frmTest.replacement.value);
}
//-->
</script>
</head>
<body>
<div id="content">
<form name="frmTest" id="frmTest" action="" method="post">
<p>Regexp: <input type="text" name="regex" value="</?(b|strong|font|span)\b(.|\n)*?>" size="50"></p>
<p>Subject string: <input type="text" name="subject" value="<font>the quick brown fox jumped over <span>the</span> lazy dog</font>" size="50"></p>
<p><input type="button" value="Test Match" onclick="frmTestClick()">
<input type="button" value="Show Match" onclick="demoShowMatchClick()"></p>
<p>Replacement text: <input type="text" name="replacement" value="replaced" size="50"></p>
<p>Result: <input type="text" name="result" value="click the button to see the result" size="50"></p>
<p><input type="button" value="Replace" onclick="demoReplaceClick()"></p>
</form>
</div>
</body>
</html>
Doesn't work??? Code: <html>
<head>
<title></title>
<style type="text/css">
</style>
<script type="text/javascript">
<!--
function stripHTML(sVal,bIgnoreBold){
var sPat="</?(b|strong|font|span)\b(.|\n)*?>",re = new RegExp(sPat,"gi");
if (sVal.match(re)) {
alert("Successful match");
} else {
alert("No match");
}
return sVal.replace(re,"");
}
//-->
</script>
</head>
<body>
<div id="content">
<form name="frmTest" id="frmTest" action="" method="post">
<label>Body: </label><textarea name="txtBody" id="txtBody" rows="10" cols="60"><font>the quick brown fox jumped over <span>the</span> lazy dog</font></textarea><br><br>
<input type="button" name="btnDoStrip" id="btnDoStrip" value="Do Strip" onclick="this.form.txtBody.value=stripHTML(this.form.txtBody.value,true);">
<input type="reset" name="btnReset" id="btnReset" value="Reset">
</form>
</div>
</body>
</html>
Cheers Al Hi wise javascript gurus, I am working on a small form that on the click of a button, it calls a function to validate a string that consists of 3 portions delimited with a dash("-") in the following format XXX-NNNN-XXX where X are letters only where N are numbers only I have to use regular expressions to validate the first portion and verify that its exactly 3 characters long that are letters only if the first portion or "plant code" is larger then 3 characters long an alert gets display also if the first portion contains alphanumeric or numeric characters an alert gets displayed, the first portion has to be in letters only. down below is my code that is not functional at the time because I know for sure the way I check for regular expressions is a bet washy but thats the only thing I was able to come up with, any help will be appreciated. thanks for making time to read my thread Code: <html>
<head>
<script type="text/javascript">
function validateit()
{
var number = document.myform.product_number.value;
var charnum = number.length;
if (number =="")
alert("you must enter a product number, field cannot be empty");
else if (charnum < 12 || charnum > 12)
alert("the product numbre has to be exactly 12 characters long");
else
validate_number(number);
}
function validate_number(num)
{
var objRegEx = /^[a-z]+$/;
split=num.split("-",3);
if (split[0].length!=3)
alert("the Plant Code portion of the Product Number has to be only three charactes long")
if!(objRegEx.test(split[0])
alert("the Plant Code portion of the Product Number has to be letters only")
}
</script>
<title>waldo's</title>
<style type="text/css">
.heading{font-weigth:bold;text-align:center; font-family:"comic sans MS"}
</style>
</head>
<body><form name="myform">
<table align="center" border="1" width="55%">
<caption style="font-family:'comic sans MS';font-size:26pt"> Waldos's WareHouse</caption>
<tr class="heading"><td>Product Number</td><td>Plant Code</td><td>Production Run</td><td>Shift Number</td></tr>
<tr><td><input type="text" name="product_number"></td><td><input type="text" name="plant_code" readonly></td><td><input type="text" name="production_run" readonly></td><td><input type="text" name="shift" readonly></td></tr>
<tr><td><input type="button" value="Check Validity" onclick="validateit()"/></td><td align="right">Validation Date:</td><td colspan="2"><input type"text" size="47" readonly></td></tr>
</table></form>
</body>
</html>
Hello everyone, I'm new to using regular expressions with javascript. I'm trying to search a string for instances of a substring with a particular prefix, followed by some numerical digits. So for instance my larger_string is: "This is a string ABCD12 EFGH124 ABCD76 EFGH90" And initially I want to find all substrings starting 'ABCD', with two following numerical digits. I can do it like this: var answer = larger_string.match(/ABCD\d\d/); But I'd really like to pass the 'ABCD' part in as a string itself, myString, as I'd then like to set myString to 'EFGH' and others, to repeat the search for those. I'm struggling with the syntax for creating a regular expression froma string. So I can do this: var reg = new RegExp("ABCD", "g"); but, this doesn't work: var reg = new RegExp("ABCD\d\d", "g"); and similarly I can do this: var myString = "ABCD"; var reg = new RegExp(myString, "g"); but, this doesn't work: var myString = "ABCD\d\d"; var reg = new RegExp(myString, "g"); What is it that I'm doing wrong here? Thank you Hey I'm trying to make a script which will check if the string which the user sent from a form contains ONLY letters. The problem is if the user entered something like this "25 years old" it allow that to be submitted. It only blocks submissions of the form if the user submits NO letters like this "12345". I want it to block submissions if at least one character isn't a letter. Here's my code: Code: var message = document.myform.formtest.value;
var allowed = /[A-z+]/;
if(!allowed.test(message)) {
alert("The field only allows letters (a-z).");
return false;
}
I have a string of code like such: Code: <font color=black>0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000</font><br><font color=black>0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000</font><br><font color=black>0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000</font><br><font color=black>000000000000000000000000000000000000000000000</font><font color=white>0000</font><font color=black>000000000000000000000000000000000000000000000</font><br><font color=black>000000000000000000000000000000000000</font> except much longer, like... 4000 lines longer. What I want to do is go through this code and replace all the zeros between <font color=black> and </font> with 1's and leave anything between <font color=white> and </font> as 0's. I just really need the regular expression not the code. I started reading a book on regular expressions and it's like... 300 pages, so it would be nice to solve this problem now, rather than have to wait to finish the book to solve this. Hopefully when I'm done reading it will make sense, but can someone help me in the meantime? Hi I have finally figured how to search a text area for URL's... as below, then reformat so they are clickable links. It works!! But it looks so so messy, is there a better way to do this?? Code: var textNodeLinks = document.getElementById("comments");
textNodeLinks.innerHTML = textNodeLinks.innerHTML.replace(/(^|[\n ])([\w]*?)((www|ftp)\.[^ \,\"\t\n\r<]*)/g, "$1<a href=http://$2$3\ rel="nofollow" target=_blank>$2$3</a>");
textNodeLinks.innerHTML = textNodeLinks.innerHTML.replace(/(^|[\n ])([\w]*?)((ht|f)tp(s)?:\/\/[\w]+[^ \,\"\n\r\t<]*)/g, "$1$2<a href=\"$3\" rel="nofollow" target=_blank>$3</a>");
Cheers I searched the forum for an answer to this question, but found nothing that was able to answer my question. I have a form and I need to validate a field against three rules: 1) The field need to be between 6 and 12 characters 2) It can only have letters, numbers, and the underscore 3) It cannot contain a space or other special characters I want the validate to happen in real-time. I have the first rule working great. Here is the code for that: Code: var username = document.getElementById('registerUsername');
if((username.value.length < 6) || (username.value.length > 12))
{
document.getElementById('usernameValidate').innerHTML="Incorrect.";
}else{
document.getElementById('usernameValidate').innerHTML="Correct.";
}
How would I be able to incorporate checking for rules 2 and 3? for the character classes [ ] , if i want to match ,.[] i cannot put them into the square brackets so how to deal with that? what if the characters are . or ! or ." (<-- combined) it fails if the regexp is [.!(.")] which will treat ( as one of the element. also the book javascript: the definitive guide says that (?=p) requires that the following characters match the pattern p, but do not include those characters in the match. However, the browser failed to figure this out (IE8) i.e. "asd:ert".match(/(?=\\w/) returns null thx in advance Dear experts I have following codes Var re=/(\d){4}-(\d){7}/; When I test this string 0300-685706263 It says TRUE But I validate this string exactly 0300-6857062 Please help can anyone explain me in detail what this regular expression mean... each and every part of this sentence: var baseRegex = new RegExp("^(?=.{6,})(?=.*^[A-Za-z]([a-zA-Z0-9_-]+)$)(?=.*[A-Z])"); Hello, How can i validate string with alphanumeric, space, dash and dot in regular expression ? I want to find in all occurrences of #(...) in a string (what is between the parentheses is unknown. At the moment I have Code: str.match(/#\(.*\)/) The problem is, I want to be able to have multiple of these in one string, like "#(hello) good #(world)", but RegExp takes me from the first '#', to the last ')'. I want to allow nested parentheses, so I am thinking that there should be away to not let it look past the second '#'. How would I do this? |
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