Regex to split alphanumeric, currency and numeric terms in PHP

Question

I am trying to split a string into terms in PHP using preg_split. I need to extract normal words ( \w ) but also currency ( even currency symbol ) and numeric terms ( including commas and decimal points ). Can anyone help me out, as I cannot seem to create a valid regex to use for preg_split to achieve this. Thanks

I need to extract terms such as: "1.545" "$143" "$13.43" "1.5b" "hello" "G9" Thanks for the reply! — dscer
– dscer, Commented Jan 6, 2012 at 23:26
It looks like you are just trying to capture anything that shows up. you could do a dotall capture easily. It's just /.+/ or are these in the of a string you need filtered? I don't understand what you are trying to split still. — Biotox
– Biotox, Commented Jan 6, 2012 at 23:31
No, that's not what I need. I need to extract the above words into an array, hence why I mentioned preg_split. I then intend to use the words one at a time in an inverted index. So, to make it clearer, I need the following sentence: "Big brown fox - $20.45" to result in an array as follows: - Big - brown - fox - $20.45 — dscer
– dscer, Commented Jan 6, 2012 at 23:40

Maxime Pacary · Accepted Answer · 2012-01-06 23:58:13Z

1

Why not use preg_match_all() instead of preg_split() ?

$str = '"1.545" "$143" "$13.43" "1.5b" "hello" "G9"'
  . ' This is a test sentence, with some. 123. numbers'
  . ' 456.78 and punctuation! signs.';

$digitsPattern = '\$?\d+(\.\d+)?';
$wordsPattern = '[[:alnum:]]+';

preg_match_all('/('.$digitsPattern.'|'.$wordsPattern.')/i', $str, $matches);

print_r($matches[0]);

edited Jan 6, 2012 at 23:58

answered Jan 6, 2012 at 23:41

Maxime Pacary

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2 Comments

dscer Over a year ago

That's quite close to what I need. Is it possible to adjust the regex to exclude the period, except in the middle of numbers? Example: "This is a number: 43234. These are some words." Your solution results in: Array ( [0] => This [1] => is [2] => a [3] => number [4] => 43234. [5] => These [6] => are [7] => some [8] => words. )

Maxime Pacary Over a year ago

I've updated my answer consequently ; could you test with the new regex?

Biotox · Accepted Answer · 2012-01-06 23:52:20Z

1

What about preg_match_all() each word with this [\S]+\b then you get an array with the words in it.

Big brown fox - $20.25 will return

preg_match_all('/[\S]+\b/', $str, $matches);

$matches = array(
 [0] = 'Big',
 [1] = 'brown',
 [2] = 'fox',
 [3] = '$20.25'
)

edited Jan 6, 2012 at 23:52

answered Jan 6, 2012 at 23:47

Biotox

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Comments

Borodin · Accepted Answer · 2012-01-06 23:39:54Z

0

Does it solve your problem to split on whitespace? "/\s+/"

answered Jan 6, 2012 at 23:39

Borodin

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1 Comment

dscer Over a year ago

Not quite, as I do not want to include punctuations except in numeric terms.

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