Regular Expression Problem 1

greenr02 · May 29, 2002

I am trying to use a Regular Expression to pull a file name from a full path into a variable.
Example:
C:\\Documents\Files\FileName.jpg
I want to pull "FileName.jpg" out of this.
I have previously done this in Perl, but the following Perl code just pulls out the 'g' off the end when I use it in Javascript:
/[^\.+]$/
Is it possible to do this in Javascript?
Thanks.

Renzy · May 29, 2002

Hi,

It is possible using javascript, the first thing you have to do is
1. Get the length of the string
2. Use lastIndexOf property to locate the last occurence of "\" then
3. use For-loop inorder to get the filename starting from the number indicated by lastIndeOf till the end of string.

Hope this helps!

xutopia · May 30, 2002

yes in order to do that you need to use () to capture the element you want. Your regExp would look like this :

/([^\\][\w\.]+)$/

[^\\] means not ever a \ character
\w means any word character (A-Z, a-z and underscore _)
\. means . character
$ means end of the input.

Here is a working example :

<html>
<head>
<title>finding Filename</title>
</head>
<body>

<form>
<input type=text value="c:\folder\folder\filename.gif">
<input type=text value="RealOne\Extension.ocx">
</form>

<script>
var trailingName = /([^\\][\w\.]+)$/;

trailingName.test(document.forms[0].elements[0].value)
document.write(RegExp.$1 + "<br>&quot

;

trailingName.test(document.forms[0].elements[1].value)
document.write(RegExp.$1 + "<br>&quot

;

</script>

</body>
</html>

Hope this helps. Gary

http://www.xutopia.com

Haran

greenr02 · Jun 2, 2002

Many thanks to renzy and xutopia, very helpful.

Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Regular Expression Problem 1

greenr02

Programmer

Renzy

Programmer

xutopia

Programmer

greenr02

Programmer

Similar threads

Part and Inventory Search

Sponsor