Regex help - probably an easy one for an expert.

[DbZ]

Hi - i'm new to the regex thing - and trying to learn it to myself -
Can someone please explain to me what the following line does -
value.replace(/\s+$/g,"")

I can kinda figure out its replacing a something with an empty space -
on a global search. But thats about it

Thanks for your help
DBZ

[Evertjan.]

DbZ wrote on 07 aug 2007 in comp.lang.javascript:

Hi - i'm new to the regex thing - and trying to learn it to myself -
Can someone please explain to me what the following line does -
value.replace(/\s+$/g,"")

Please read the NG FAQ entry.
<http://www.jibbering.com/faq/#FAQ4_16>

However your string is not made by an expert,
because using the global flag "g" makes no sense,
when specifying the end of string "$" in the regex string.

I can kinda figure out its replacing a something with an empty space -
on a global search. But thats about it

--
Evertjan.
The Netherlands.
(Please change the x'es to dots in my emailaddress)

[Tim Streater]

In article <11**********************@19g2000hsx.googlegroups. com>,
DbZ <de**********@gmail.comwrote:

Hi - i'm new to the regex thing - and trying to learn it to myself -
Can someone please explain to me what the following line does -
value.replace(/\s+$/g,"")

I can kinda figure out its replacing a something with an empty space -
on a global search. But thats about it

My advice is to steer clear of regex as much as you possibly can,
because anything more complex than the most simple examples are
incomprehensible about 5 mins after you last understood it.

[Evertjan.]

Tim Streater wrote on 07 aug 2007 in comp.lang.javascript:

My advice is to steer clear of regex as much as you possibly can,
because anything more complex than the most simple examples are
incomprehensible about 5 mins after you last understood it.

Bad advice, Tim.

As well as being terribly handy and enjoyable,
writing Regex is an important antidote
to Alzheimer progression.

--
Evertjan.
The Netherlands.
(Please change the x'es to dots in my emailaddress)

[Thomas 'PointedEars' Lahn]

DbZ wrote:

Hi - i'm new to the regex thing - and trying to learn it to myself -

I can very much recommend reading the two free sample chapters of Mastering
Regular Expressions First and Second Edition by Jeffrey E. F. Friedl at
O'Reilly Online. And probably the book is worth buying.

http://www.oreilly.com/catalog/regex/ pp.

Can someone please explain to me what the following line does -
value.replace(/\s+$/g,"")

I can kinda figure out its replacing a something with an empty space -
on a global search. But thats about it

It is replacing one or more consecutive (`+') whitespace (`\s') at the end
(`$') of the string `value' with the empty string (`""', i.e. removing the
matched substring) and returns the result. (The `g'lobal flag which would
make the expression to apply to *every* match, not only the first one, is
therefore unnecessary here; there can be only one match because the
expression is anchored by `$'.)

For the above to have effect, you would need to assign the result to
something, for example:

value = value.replace(/\s+$/, "");
HTH

PointedEars
--
Prototype.js was written by people who don't know javascript for people
who don't know javascript. People who don't know javascript are not
the best source of advice on designing systems that use javascript.
-- Richard Cornford, cljs, <f8*******************@news.demon.co.uk>

[Evertjan.]

Dr J R Stockton wrote on 07 aug 2007 in comp.lang.javascript:

>>As well as being terribly handy and enjoyable,
writing Regex is an important antidote
to Alzheimer progression.

No : it does not make you keep your wits as you get much older, it
merely makes you feel much older while retaining the earlier wits, if
any.

John, you are pesimistic about the "use it or lose it" potential,

It is not decided yet.

Mental exercise [in the Morris water maze] really seems to have more than a
placebo effect:
"Voluntary Exercise Decreases Amyloid Load in a Transgenic Model of
Alzheimer's Disease" [The Journal of Neuroscience, April 27, 2005, 25
(17):4217-4221;]
<http://www.jneurosci.org/cgi/content/short/25/17/4217>

On the other hand:

Commentary: Activity each day keeps dementia away —
does social interaction really preserve cognitive function?
<http://ije.oxfordjournals.org/cgi/reprint/34/4/872>

--
Evertjan.
The Netherlands.
(Please change the x'es to dots in my emailaddress)