regex match string in range

Question

I am new in regular expression and I want to know if following is possible to done with it.

I want to match string with provided positions.

For example

$input = 'text example'.

I want to match the letters from 4th to 7th, that is

"t ex".

In this case, how can I write the regex?

I tried below

'/^.{4,7}.*$/e'

its with e filter because I want to use function of it, but this way is not the result I want...

Thank you for your help!

Avinash Raj · Accepted Answer · 2015-09-23 18:02:49Z

2

You may use substring for this. If you really want to use regex then try this,

preg_match('~^.{3}\K.{4}~', $str);

\K discards previously matched characters from printing at the final. You may also use positive look-behind instead of \K.

answered Sep 23, 2015 at 18:02

Avinash Raj

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2 Comments

Thank you very much!, I think this is what I want, I will accept this when time limit passed.

Can I ask one more question? if I want to have 4th and 7th only not in range, how should I change the pattern?