Adding exceptions to the function

Question

I have got a function which is use to take a string and convert it to the desired form i.e. Sentence case.

function sentence_case($string) {
$sentences = preg_split('/([.?!]+)/', $string, -1, PREG_SPLIT_NO_EMPTY|PREG_SPLIT_DELIM_CAPTURE);
$new_string = '';
foreach ($sentences as $key => $sentence) {
    $new_string .= ($key & 1) == 0?
        ucfirst(strtolower(trim($sentence))) :
        $sentence.' ';
}

$new_string = clean_spaces($new_string);
$new_string = m_r_e_s($new_string);
return trim($new_string);
}

Now I want to modify this function for " i ", as whenever we have I in out sentence than it remain capital how can I add exception to particular words like..." i ", " i' " etc.

rid · Accepted Answer · 2011-11-10 04:37:23Z

2

preg_replace('/\bi\b/', 'I', $new_string);

answered Nov 10, 2011 at 4:37

rid

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4 Comments

Daniel Over a year ago

This will make aaaaaa i aaaaa into aaaaaaIaaaaa

Rahul Singh Over a year ago

in case of " i'" is it correct preg_replace('/\bi\'/', 'I'', $new_string);

rid Over a year ago

@Dani, it won't. \b is an anchor.

rid Over a year ago

@Rahul Singh, the expression will replace i, ` i, i , i', ,i, etc. You don't need to adapt it in any way for i` followed by '. \b means "word boundary". Any i that is not part of a word will be replaced.

erm410 · Accepted Answer · 2011-11-10 04:44:37Z

0

You could use a str_replace on the lower case string $new_string = str_replace(' i ', ' I ', $new_string). String operations are less expensive than preg for simple replacements. However, you will need one exception for every pronoun.

answered Nov 10, 2011 at 4:44

erm410

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2 Comments

erm410 Over a year ago

On second thoughts, preg word boundaries are a much more elegant way to find words rather than assuming whitespace. +1 to Rahul's answer.

rid Over a year ago

You will also need a different str_replace() call for each possible punctuation mark that might follow the i...

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