regular expression to match name initials - PCRE

Question

I have a regular expression to get the initials of a name like below:

/\\b\\p{L}\\./gu

it works fine with English and other languages until there ar

Answer 1

You need to match diacritic marks after base letters using \p{M}*:

'~\b(?<!\p{M})\p{L}\p{M}*\.~u'

The pattern matches

• \b - a word boundary
• (?<!\p{M}) - the char before the current position must not be a diacritic char (without it, a match can occur within a single word)
• \p{L} - any base Unicode letter
• \p{M}* - 0+ diacritic marks
• \. - a dot.

See the PHP demo online:

$s = "क. ಕ. के. ಕೆ. ";
echo preg_replace('~\b(?<!\p{M})\p{L}\p{M}*+\.~u', '<pre>$0</pre>', $s); 
// => <pre>क.</pre> <pre>ಕ.</pre> <pre>के.</pre> <pre>ಕೆ.</pre>