regex - PHP Regular expression match multiple keywords Where last keyword is optional -


i have following text , need find part of text after specific keyword

apple tasty fruit     orange cool mango used make shakes         banana healthy food

here regular expression

/apple(.*)orange(.*)mango(.*)banana(.*)/is

here output

array(     0   =>  array(0 => apple tasty fruit orange cool mango used make shakes banana healthy food)     1   =>  array(0 => tasty fruit)     2   =>  array(0 => cool)     3   =>  array(0 => used make shakes)     4   =>  array(0 => healthy food) )

it works fine if keywords in string apple, orange, mango, , banana. want regular expression still work if last keyword banana not provided.

apple tasty fruit     orange cool mango used make shakes  array(         0   =>  array(0 => apple tasty fruit orange cool mango used make shakes)         1   =>  array(0 => tasty fruit)         2   =>  array(0 => cool)         3   =>  array(0 => used make shakes)     )

method 1

use ? quantifier let bandana "optional" along or specify end

apple(.*?)orange(.*?)mango(.*?)(?:banana(.*)|$)

i've made lazy matching can work. because of this, need add new things:

(?:            starts non-capture group    banana(.*)  selects "banana" , text after |              or (if there no banana)    $           matches end. )

demo

method 2

apple(.*?)orange(.*?)mango(.*?)(?:banana(.*))?$ makes "banana" optional

this uses (?:)? make "banana" part optional. $ needed anchor know regex ends. can used make many parts optional without work:

apple(.*?)(?:orange(.*?))?mango(.*?)(?:banana(.*))?$  makes "banana , orange" optional

demo

method 3

this require below exist:

apple(.*?)(?:orange(.*?)(?:mango(.*?)(?:banana(.*)|$)|$)|$)|$

demo

this bit hard explain checkout demo , mess 1 of words (apple, orange, banana, mango)


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