preg_replace Array with HTML tags?

Question

I have a string that I converted to an array. And the same string that I converted are keywords from a search that match keywords in a chunk of text.

I am wanting to with the array, use the keywords within it to add html tags to the chunk of text that have the similar keywords.

For example: keywords: dog, cat, cow

Text before: I own two dogs, four cats, and twenty cows.

Text after: I own two dogs, four cats, and twenty cows.

The chunk of text I have is in a variable.

But I am not sure what regex I exactly need, to use with preg_replace();.

<?php
    echo preg_replace($text, <b></b>, $keywords);
?>

Am I even going the right direction?

Barmar · Accepted Answer · 2013-11-01 17:33:07Z

2

Create a regexp that uses alternation to match any of the words, by joining the words with |. In the replacement string, use $0 to refer to the part of the text that was matched.

$regexp = '/\b(' . implode('|', $keywords) . ').*?\b/i';
echo preg_replace($regexp, '<b>$0</b>', $text);

DEMO

edited Nov 1, 2013 at 17:33

answered Oct 31, 2013 at 21:33

Barmar

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5 Comments

Justin Clarke Over a year ago

Thanks, it outputs the text, but none of the keywords have been wrapped by the <b></b> tags, I'm I missing something?

Barmar Over a year ago

Works for me, see the demo.

Justin Clarke Over a year ago

my issue is that my keywords are both lowercase and uppercase, and the text may be the vice versa. How can adjust the Regex to match the text if either are upper or lower?

Barmar Over a year ago

Add the i modifier to the regular expression to make it case-insensitive. That should be obvious. I've updated the answer.

Justin Clarke Over a year ago

Thanks! That was it. Regex is so confusing to me.

anubhava · Accepted Answer · 2013-10-31 21:33:41Z

0

You can use this code:

echo preg_replace('/\b((?:cat|dog|cow)\S*)/i', `<b>$1</b>`, $keywords);

answered Oct 31, 2013 at 21:33

anubhava

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1 Comment

Barmar Over a year ago

You can use \S instead of [^\s]

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