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Regexp help !

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Aug 16.2008

Hi,

Please tell me how to get start with regular expression, mean how to know rule and syntax of wriitng regular expression like this one

[COLOR=”Red”]exp = /^(([a-zA-Z0-9–._]+)@(([a-zA-Z0-9–_]+.)+)([a-z]{2,3})([,;]W?(?!$))?)+$/;[/COLOR]

I have to do it for multiple email address validation. It is working alright but there is one problem in it , when i write email address like this
[email][email protected]@go.com[/email]

It should return false, but it return true.
Can any one tell me how to do right it ?

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JavaScript

5 Comments(s) ↴

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@scragarAug 16.2008 — <i>
</i>/ start/end of the regexp
^ start of the string
( ) enclosures, that's handy for grouping things
[ ] one of the characters/sets inside it
a-z A-Z 0-9 letters a to z, A to Z or numbers 0-9 respectively
- . literally the - or . respectively
+ 1 or more
{n, m} between n and m of the group
W any word character
? optional
* any number
$ end of stringthat any good?
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@RabidRickAug 16.2008 — I think if you get rid of the last "+" it will be fine (it looks like you're matching the whole main grouping multiple times)
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@hoangkcAug 16.2008 — [code]
...
W any word character
...
[/QUOTE]

please tell me if I'm wrong.
As I know,
w Match a word character (alphanumeric characters and "_")
and
W Match a non-word character
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@scragarAug 16.2008 — yeah, your right, same rule applies to d and D for digits, capitals are inverted.
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@sayfrndshipauthorAug 22.2008 — Thnks !
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