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PHP regex periods

Answer 1

+1 A:

jensgram 2010-10-25 06:53:53

What I have is /\$[0-9]{1,}\./ but when I put in $645. it doesn't recognize the regex. I'm 12 and what is this?

TOKYOTRIBE4EVAR 2010-10-25 06:56:14

Ahh, @Gumbo elaborated on his answer too :(

jensgram 2010-10-25 07:02:21

So how does it not recognize the closing period on my string?

TOKYOTRIBE4EVAR 2010-10-25 07:03:17

@TOKYOTRIBE4EVAR Please add examples to your question body. Also, are you serious? (*"I'm 12 and what is this?"*)

jensgram 2010-10-25 07:04:59

Lol no, it's just a kewl new meme that I learned about at my school's /b/ club today.

TOKYOTRIBE4EVAR 2010-10-25 07:07:51

We also watched this funny video called goosh goosh and looked at all these cat pictures. /b/ is the best site!

TOKYOTRIBE4EVAR 2010-10-25 07:08:29

Oh as for examples, here's how I used it in my code

TOKYOTRIBE4EVAR 2010-10-25 07:11:30

echo(preg_match("/\$\d{1,}\./", '$645.', $matches));

TOKYOTRIBE4EVAR 2010-10-25 07:12:18

@TOKYOTRIBE4EVAR Be aware of the double-quoting (see my answer). Also, the interesting part is the `$matches`, not the return value from `preg_match()`.

jensgram 2010-10-25 07:15:44

@TOKYOTRIBE4EVAR Try `'/\$\d{1,}\./'`

jensgram 2010-10-25 07:18:22

The $matches is really kinda just there foar now but later I will have that in thar for reals. When I did that echo, everything up to the period returns a 1 but once I add in the period there's a 0.

TOKYOTRIBE4EVAR 2010-10-25 07:18:50

@TOKYOTRIBE4EVAR Working here: http://www.ideone.com/O1bEF

jensgram 2010-10-25 07:19:51

So I need to has single quotes around my regex?

TOKYOTRIBE4EVAR 2010-10-25 07:21:32

@TOKYOTRIBE4EVAR Either that or escape properly. See my updated answer.

jensgram 2010-10-25 07:26:09

Answer 2

+3 A:

Since . is a special character, you need to escape it to have it literally, so \..

Remember to also escape the escape character if you want to use it in a string. So if you want to write the regular expression foo\.bar in a string declaration, it needs to be "foo\\.bar".

Gumbo 2010-10-25 06:54:49

What I have is /\$\d{1,}\./ but when I put in $645. it doesn't recognize the regex on the period. I'm 12 and what is this?

TOKYOTRIBE4EVAR 2010-10-25 07:01:11

@TOKYOTRIBE4EVAR: How do you use that regular expression?

Gumbo 2010-10-25 07:04:49

echo(preg_match("/\$\d{1,}\./", '$645.', $matches));

TOKYOTRIBE4EVAR 2010-10-25 07:05:27

@TOKYOTRIBE4EVAR: Note that `preg_match` does only return whether a match has been found or not (either `1` or `0`). You need to look at the array `$matches` to see what has been matched.

Gumbo 2010-10-25 07:13:30

It returned a 0, which means that there was no match. Is there something wrong with my period escape or am I just getting trolled really hard?

TOKYOTRIBE4EVAR 2010-10-25 07:15:09

You need to escape the `\ ` in `\$` too: `"/\\\$\d{1,}\./"`. With only `\$` it is replaced inside *double quotes* to `$` that means the end of the string. This would be fine in single quotes, e.g. `'\$'` → `\$`, as `\$` is not a known escape sequence. But in double quotes it is, so that `"\$"` → `$`.

Gumbo 2010-10-25 09:27:50

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