Please Explain line below for me ...

[andreateh]

I'm new to JavaScript. So can any one please explain line below for me? Thanks.

var re = /^[a-zA-Z0-9]{1}[a-zA-Z0-9\-\._]+\@{1}[a-zA-Z0-9\-\._]+\.{1}[a-zA-Z0-9\-\._]+[a-zA-Z0-9]{1}$/

^[a-zA-Z0-9]{1}

Mean First character must be between "a-z" or "A-Z" or "0-9" and exactly occur 1 time.

[a-zA-Z0-9\-\._]+\@{1}
[code]
This line should be almost as above except "a-z" or "A-Z" or "0-9" at lease 1 or more occurrence and exactly "@" occur 1 time. 

But i can't understand [b]\-\._[b] mean what ?

 

[BabyJeffy]

I think they are as follows:

\- is an escaped "-" character (I don't think this needs to be escaped)
\. is an escaped "." character (since "." on it's own would translate to "any single character&quot
_ is just a normal "_" character

Hope that helps,
Jeff

 

[simonchristieis]

Following on to babyjeffy's response,
the code you have posted is not javascript - it is called regular expressions, or if your an IT guru - regEx ;o)

here is a tutorial:

http://gnosis.cx/publish/programming/regular_expressions.html

simon

 

[BillyRayPreachersSon]

I've always thought it was regExp, not regEx... Are both valid ways of referring to regular expressions?

 

[andreateh]

Thanks.

 

[jemminger]

BillyRayPreachersSon,

the actual object is

RegExp()

, but it's easier to say "regex"

=========================================================
-jeff

http://www.jeffemminger.com

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