Preg_match expression to find code in string

Example strings:

$string = "Buyer must enter coupon code 10OFF100 in shopping cart.";
$string = "Get $20 Off Auto开发者_JS百科 Parts Order Over $150. Use Coupon code: GAPCJ20";

I need to extract the codes (10FF100 and GAPCJ20).

I was trying to create a preg_match to find "coupon code" and "coupon code:" and extract the phrase or word immediately after. Not having much luck myself or finding the reg expression.

Can some post the proper code please.

Thanks for the help.

---

Use this php code:

$arr = array("Buyer must enter coupon code 10OFF100 in shopping cart.", "Get $20 Off Auto Parts Order Over $150. Use Coupon code: GAPCJ20");
foreach ($arr as $s) {
   preg_match('~coupon code\W+(\w+)~i', $s, $m);
   var_dump($m[1]);
}

OUTPUT

string(8) "10OFF100"
string(7) "GAPCJ20"

---

Try the following: /coupon code[:]? ([\w]*)/i

---

My try:

<?php
if (preg_match('/coupon code:?\s+(.+)(\s+|$)/', $str, $matches)) {
  list(, $code) = $matches;
  echo $code;
}

---

For your first variant use

Buyer must enter coupon code ([^ ]*) in shopping cart.

For the second use

Get $20 Off Auto Parts Order Over $150. Use Coupon code: (.*)

---

I do below.

preg_match('/[Cc]oupon code:?(\w+)/',$string,$match);

---

This will match optional : with a "code" which is expected to consist of alpha and numeric.

/coupon code:? ([a-z0-9]+)/i

---

Will this do?

Short answer: no.

So how to make it more efficient? Well the best thing to do would be to match a regex against a dictionary of lines that has many examples and formats you want to support. Then keep refining your regex until you get one that is 98% reliable. I say 98% because your probably come to the realization that it will never be perfect as there are so many:

• Possible miss-spellings
• Coupon codes using different characters sets
• Variation of sentences and ordering of words i.e.
  • Free Coupon: Enter this code 8HFnF5
  • Code for coupon (7859NhF)
  • Coupons galore! Just put 646GH4 in your basket
  • Cupon code is 797gGh
  • Your code for free goodies is 4543G5
  • Add token "5479_G5t" to your basket for free CD!
  • ... all of these will fail with the above regex