Question

For example i have string one two three four five and I want remove all characters before two and after four , I know that is function preg_replace() but I don’t know how to write this expression, I not know what does mean for example ‘/([a-z])([A-Z])/’ please say what is name of this expression in $pattern and what they mean

Answer 1

In case you’re looking for preg_replace based solution then here it is:

$str = 'one two three four five';
var_dump ( preg_replace('#^.*?(two.*?four).*$#i', '$1', $str) );

Expanation: RegEx used in preg_replace first matches text upto your starting text two then matches upto your end text four and finally replaces it with matched string thus discarding all text before two and all text after four. Please note .*? makes your matching non-greedy. Read more about regex here: http://www.regular-expressions.info/

OUTPUT

string(14) "two three four"