CODEWITHSUNDEEP
phpregex
user3147180
user3147180

Reputation: 943

How can i make uppercase letter in php regex after underscore

I am replacing the first_name_user with 'firstNameUser' in php.

I am trying this

$key1 = preg_replace('/_([a-z]?)/', '\U\1', $key);

and its not working

Upvotes: 2

Views: 1769

Answers (2)

Phil Cross
Phil Cross

Reputation: 9302

Alternate to @roblll answer, if you don't want to use regex, you could use:

$str = "some_underscored_text";
$new_str = lcfirst(str_replace(' ', '', ucwords(str_replace('_', ' ', $str))));

echo $new_str;     // Outputs: someUnderscoredText

Upvotes: 0

RobIII
RobIII

Reputation: 8821

$key1 = preg_replace('/_([a-z]?)/e', 'strtoupper("$1")', $key);

But this uses the e modifier which has some issues security implications and is deprecated as of PHP 5.5.0 anyways.

Caution

Use of this modifier is discouraged, as it can easily introduce security vulnerabilites

Better use:

$key1 = preg_replace_callback('/_([a-z]?)/', function($match) {
            return strtoupper($match[1]);
        }, $key);

See this question and this question for more examples / code and information.

Upvotes: 3

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