regular expression to replace space by underscore

a2rodger

I am using the following code to replace spaces with "_" for my URL rewriting
function.

$url = urlencode(preg_replace("/\s/e" , "_" , $url));

It get thrown the following error and can't figure out what it's trying to tell me,

Notice: Use of undefined constant _ - assumed '_' in : regexp code on line 1

Help!

(Note: I'm using PHP Version 5.2.4)

code green

Quote:

It get thrown the following error and can't figure out what it's trying to tell me

Expand|Select|Wrap|Line Numbers

 Notice: Use of undefined constant _ - assumed '_' in : regexp code on line 1
 

When php finds characters outside quotes it knows it is useable code.
A lone word with no dollar $ in front is assumed to be a constant.
Constants should be defined before use or an error is generated
This means you have an underscore outside the quotes somewhere.
[PHP]preg_replace("/\s/e" , "_" , $url));[/PHP]
Use single quotes to avoid confusion but it may be in $url.

ericoos

please i want creat a step by step online form, pls kindly give me steps to creat it thanks

a2rodger

Getting rid of the 'e' seemed to solve the problem.
Although I'm not sure why.

preg_replace("/\s/" , "_" , $url));

code green

The slashes indicate the beginning and end of an expression not the quotes.
So the 'e' was ouside the expression

Markus

Quote:

Originally Posted by code green

The slashes indicate the beginning and end of an expression not the quotes.
So the 'e' was ouside the expression

As was intended; the 'e' is a modifier and, therefore, comes after the expression.

code green

And the e-modifier treats the replacement string as php code.

ronverdonk

A new thread has been split off this one. See want to lear regular expressions

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