Regular Expressions: Numeric Value before Occurrence PHP

Question

Given the string:

100,000 this is some text 12,000 this is text I want to match.

I need a regular expression that matches 12,000 based on matching

text I want to match

So, we can get a position with:

strpos($haystack, 'text I want to match');

Then, I guess we could use a regular expression to look backwards:

But, this is where I need help.

Wouldn't you match a number followed by what you want to match? Like ([\d,]+) this is text I want to match. — Marty
– Marty, Commented Feb 9, 2015 at 22:58

hwnd · Accepted Answer · 2015-02-09 23:19:35Z

2

If you know that the digits will always precede the based context you want to match ...

preg_match('/([\d,]+)\D*text I want to match/', $str, $match);
var_dump($match[1]);

edited Feb 9, 2015 at 23:19

answered Feb 9, 2015 at 23:14

hwnd

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Comments

Ruben Kazumov · Accepted Answer · 2015-02-10 00:20:12Z

2

It is simple:

/ ([0-9,]+) this is text I want to match\.$/

Demo:

http://sandbox.onlinephpfunctions.com/code/b288ca9a322c7a5b54c6490334540ab142b6a979

edited Feb 10, 2015 at 0:20

answered Feb 9, 2015 at 22:59

Ruben Kazumov

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1 Comment

drew schmaltz Over a year ago

This was a great quick answer but a more complete answer that allowed more of the flexibility I needed was offered.

Ahosan Karim Asik · Accepted Answer · 2015-02-10 09:47:37Z

0

Another solution:

$re = "/([\\d,]+)(?=\\D*text I want to match)/";
$str = "100,000 this is some text 12,000 this is text I want to match.";

preg_match($re, $str, $matches);

Live demo

answered Feb 10, 2015 at 9:47

Ahosan Karim Asik

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