help with regex

[syed]

Hi guys, hope someone can help, Im having some problems spliting a string using the preg_split function. Basically im trying to split a string similar to this.

 

x > 1

Output needs to be array([0]=>x[1]=>>[2]=>1)

 

I need a regex that can also split on

 

x >= 1  or

x <= 1 or

x = 1 or

x != 1

 

Currently im using this, $regx = "/(<=|<|=|>|>=)/"; but for expressions like x >= 1  the returned array contains 2 elements one for each operator, I need just the one.

 

Any help will be greately appreciated.

[AbraCadaver]

Unless you have much more complex examples, I would just explode() on space.

[syed]

Thank you for your reply, I should have mentioned that the space in the expression may or may not be present.

[AbraCadaver]

Thank you for your reply, I should have mentioned that the space in the expression may or may not be present.

You may have to trim some of the results:

 

$array = preg_split('/([<>=!]+)/', $string, null, PREG_SPLIT_DELIM_CAPTURE);

[muzzs]

Hi Syed,

 

AbraCadaver has a pretty good solution but it can be improved upon, their solution will match "x < 1", "X <= 1" and "x <=! 1" etc...

 

I would do:

$array = preg_split('/([<>=!]{1,2})/', $string, null, PREG_SPLIT_DELIM_CAPTURE);

 

Hope that helps!

 

Muzzs

[salathe]

Currently im using this, $regx = "/(<=|<|=|>|>=)/"; but for expressions like x >= 1  the returned array contains 2 elements one for each operator, I need just the one.

 

With that regex, >= will never get matched because > and = both occur individually before it in the group of alternatives.  Matching stops at the earliest successful match of an alternative.  If you moved >= earlier (at least, before = and >), then it would work fine just like <= does.