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Question

stripping out all characters from a string, leaving numbers

Answer 1

+1 A:

preg_replace('/[^0-9.]/', '', $string);

Ionuț G. Stan 2010-01-22 14:51:48

Escape the dot.

Robin 2010-01-22 14:52:32

Robin, there's no need. I've tested it before posting and works OK.

Ionuț G. Stan 2010-01-22 14:54:14

@Robin, you would need to escape the period if it were outside of the brackets []. inside the square brackets the period is not treated as a special character

Jonathan Fingland 2010-01-22 14:58:39

@Robin: The text inside the [] is defining a set of characters; it doesn't really make much sense for the '.' character to mean any character in that context.

CodeSavvyGeek 2010-01-22 15:00:25

Answer 2

+9 A:

$str = preg_replace('/[^0-9.]+/', '', $str);

replace substrings that do not consist of digits or . with nothing.

Don 2010-01-22 14:52:02

Someone who took the time to (briefly) comment on his answer!

Veger 2010-01-22 14:55:35

@Veger, SO tends to promote typos and short answers -- well I try to fight it.

Don 2010-01-22 21:58:16

@Don: Good that makes at least two of us!

Veger 2010-01-22 23:42:09

Answer 3

A:

$input = 'some str1ng 234'
$newString = preg_replace("/[^0-9.]/", '', $input)

Juraj Blahunka 2010-01-22 14:53:04

Answer 4

A:

To satisfy my curiosity I asked about the speed of the proposed answers and as shown in preg_replace speed optimisation/ it is (much) faster to use str_replace() than preg_replace().

So you might want to use str_replace() instead.

Veger 2010-01-25 09:29:38

But you can't really use `str_replace()` in this case, unless you want to hardcode all characters which are not numbers.

kemp 2010-01-25 09:53:57

@kemp, hm... yes that's true. That would be too much :)

Veger 2010-01-25 10:17:12

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stripping out all characters from a string, leaving numbers

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