regular expression

[Bruno Storz]

Hi there,

I have strings like

asdf asdf asdf "test.gif" blabla
or
asdf asdf asdf 'test.gif' blabla

I want to extract test.gif. Because I will see " or ' in the string, I was
(so far) unable to create a regular expression for this problem

Regards

Bruno

[Martin Honnen]

Re: regular expression



Bruno Storz wrote:

[color=blue]
> I have strings like
>
> asdf asdf asdf "test.gif" blabla
> or
> asdf asdf asdf 'test.gif' blabla
>
> I want to extract test.gif. Because I will see " or ' in the string, I was
> (so far) unable to create a regular expression for this problem[/color]

Here is an example

var strings = [
'asdf asdf asdf "test.gif" blabla',
'asdf asdf asdf \'test.gif\' blabla',
'asdf sdasd asdf adfadf'
];
var pattern = /(["'])(\w+\.gif)(\1)/;
for (var i = 0; i < strings.length; i++) {
var match = pattern.exec(st rings[i]);
if (match) {
alert('found ' + match[2]);
}
else {
alert(pattern + ' doesn\'t match ' + strings[i]);
}
}

the pattern (["'])(\w+\.gif)(\1) looks for something.gif delimited by
double or single quotes

--

Martin Honnen

http://JavaScript.FAQTs.com/

[mscir]

Re: regular expression

Martin Honnen wrote:
[color=blue]
> Bruno Storz wrote:[color=green]
>> I have strings like
>> asdf asdf asdf "test.gif" blabla
>> or asdf asdf asdf 'test.gif' blabla
>> I want to extract test.gif. Because I will see " or ' in the string, I
>> was (so far) unable to create a regular expression for this problem[/color][/color]
[color=blue]
> Here is an example
> var strings = [
> 'asdf asdf asdf "test.gif" blabla',
> 'asdf asdf asdf \'test.gif\' blabla',
> 'asdf sdasd asdf adfadf'
> ];
> var pattern = /(["'])(\w+\.gif)(\1)/;
> for (var i = 0; i < strings.length; i++) {
> var match = pattern.exec(st rings[i]);
> if (match) {
> alert('found ' + match[2]);
> }
> else {
> alert(pattern + ' doesn\'t match ' + strings[i]);
> }
> }
> the pattern (["'])(\w+\.gif)(\1) looks for something.gif delimited by
> double or single quotes[/color]

Nice job. Can you recommend any sites you like about learning to use
regular expressions?

Mike

[Lasse Reichstein Nielsen]

Re: regular expression

"Bruno Storz" <bruno_storz@gm x.de> writes:
[color=blue]
> I have strings like
>
> asdf asdf asdf "test.gif" blabla
> or
> asdf asdf asdf 'test.gif' blabla
>
> I want to extract test.gif. Because I will see " or ' in the string, I was
> (so far) unable to create a regular expression for this problem[/color]


This will do that for new browsers:

var re = /(['"])([^\s]*?)\1/;
var match = re.exec(someStr ing);
var file = match && match[2];

It only matches one file name per string, and the file name cannot
contain a space.
The omission of spaces is to avoid apostrophes occuring in the
surrounding text, e.g.:
So I can't download the file 'foo.bar', it's broken

Only recent browsers accept non-greedy matching and back references
in regular expressions.

Another, more cumbersome version (although not as much as I expected,
I see now that I wrote it) is:

var re = /"([^"]*)"|'([^'\s]*)'/;
var match = re.exec(someStr ing);
var file = match && (match[1] || match[2]);

It should work in most browsers.

/L
--
Lasse Reichstein Nielsen - lrn@hotpop.com
DHTML Death Colors: <URL:http://www.infimum.dk/HTML/rasterTriangleD OM.html>
'Faith without judgement merely degrades the spirit divine.'

[Thomas 'PointedEars' Lahn]

Re: regular expression

mscir wrote:
[color=blue]
> [...] Can you recommend any sites you like about learning to use
> regular expressions?[/color]

Besides
<http://devedge.netscap e.com/library/manuals/2000/javascript/1.5/reference/regexp.html>
and <http://php.net/pcre>, (sample) chapter 4 of
<http://www.oreilly.com/catalog/regex/> helped me a lot.
Most certainly the entire book can be recommended.


HTHU2 :)

PointedEars

[mscir]

Re: regular expression



Thomas 'PointedEars' Lahn wrote:[color=blue]
> mscir wrote:
>
>[color=green]
>>[...] Can you recommend any sites you like about learning to use
>>regular expressions?[/color]
>
>
> Besides
> <http://devedge.netscap e.com/library/manuals/2000/javascript/1.5/reference/regexp.html>
> and <http://php.net/pcre>, (sample) chapter 4 of
> <http://www.oreilly.com/catalog/regex/> helped me a lot.
> Most certainly the entire book can be recommended.[/color]
[color=blue]
> HTHU2 :)
> PointedEars[/color]

Thanks,
Mike