Regular Expression

[jester18]

Hello All,

 

I am wondering if you could help me? I know I have to use a regular expression but I'm really not sure how to achieve this, I want to be able to pull only the rate out of numerous currencies, 

 

an example: 1 British Pound Sterling = 1.55727 Canadian Dollar

 

all I want to pull from that is 1.55727  ...the only way I know how is to do it by the amount of digits after the equals sign however that number can change so now im stuck.

 

Would anyone be able to help me?

[MatthewJ]

$regex = "/= \d+\.?\d+/";
$test = "1 British Pound Sterling = 1.55727 Canadian Dollar";
$matches = preg_match($regex, $test, $output);
echo $output[0];

 

That will get the "= 1.55727" portion

 

the regex just says = followed by a space, followed by any digits, followed by an optional decimal, followed by and number of digits

 

Hope that helps

[jester18]

thanks for the swift reply, do you know how i could remove the ='s aswell from it? so its literally just the numerical portion 1.55727

 

Thank you!

[MatthewJ]

I thought about that... I left them in so it wouldn't get confused by any other numbers in the string (if there happen to be more than just the 1 at the beginning). You could just do it with

 

$output[0] = str_replace("= ", "", $output[0]);

 

If though it will always be "1 thiscurrency = numeric rate" you could just remove the "= " from the regex so it would be

 

$regex = "/\d+\.?\d+/";