PHP: How to fix my preg_replace code

Question

If I have a string like

$str = "Hello [Page 1] World [Page 23] Hello [Page 35] World [Page 624]";

And I want to remove all instances of "[Page #]"

How would I go about doing that?

Here's what I've got so far...

preg_replace('[Page [0-9]]', '', $str);

Brad Christie · Accepted Answer · 2011-02-18 05:17:35Z

1

Remember that [ and ] are class delimiters. When you want to use them as literals you need to escape them (prefix with \) first. So:

/\[Page [0-9]+\]/i

is probably your best bet. Surround the pattern with /, add a + to your number range to match "1+ numbers", and the final i means case-insensitive match (P or p in "Page") (remove if that's not your intent).

answered Feb 18, 2011 at 5:17

Brad Christie

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at0mzk · Accepted Answer · 2011-02-18 05:24:29Z

0

preg_replace('/\\[Page [0-9]+\\]/', '', $str)

edited Feb 18, 2011 at 5:24

answered Feb 18, 2011 at 5:16

at0mzk

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3 Comments

at0mzk Over a year ago

need to escape the [ to match them. the plus means one or more.

Jimmy Ruska Over a year ago

You also need to add a delimiter eg /pattern/ or @pattern@

at0mzk Over a year ago

and double escape to get the escape into the pattern. corrected the answer.

derRaphael · Accepted Answer · 2016-06-23 14:32:50Z

0

/\[Page \d+\]/

works, too. \d is shorthand for number-chars.

answered Jun 23, 2016 at 14:32

derRaphael

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