CODEWITHSUNDEEP
phpregex
Conserta
Conserta

Reputation: 99

preg_match for one single digit number with a blank space on both sides

I need to output the single 3 in the array below using preg_match or preg_split, how can I accomplish this? This possibilities are 1 through 8.

VMName Count CompatibilityForMigrationEnabled CompatibilityForOlderOperatingSystemsEnabled ------ ----- -------------------------------- -------------------------------------------- ap-1-38 3 False False

I have tried the following with no success using both preg_match and preg_split:

('\\s+\\d\\s+', $output)
('\\s+[\\d]\\s+', $output)
("^[\s0-9\s]+$", $output)
("/(.*), (.*)/", $output)

Upvotes: 0

Views: 1454

Answers (3)

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 627082

To match a 1 to 8 number that is in between whitespaces, you may use

preg_match('~(?<!\S)[1-8](?!\S)~', $s, $match)

See the regex demo.

Details

  • (?<!\S) - a whitespace or start of string required immediately to the left of the current location
  • [1-8] - a digit from 1 to 8
  • (?!\S) - a whitespace or end of string required immediately to the right of the current location

See PHP demo:

$str = 'VMName Count CompatibilityForMigrationEnabled CompatibilityForOlderOperatingSystemsEnabled ------ ----- -------------------------------- -------------------------------------------- ap-1-38 3 False False';
if (preg_match('/(?<!\S)[1-8](?!\S)/', $str, $match)) {
    echo $match[0];
}
// => 3

Note you may also use a capturing approach:

if (preg_match('/(?:^|\s)([1-8])(?:$|\s)/', $str, $match)) {
    echo $match[1];
}

See the regex demo and the PHP demo.

Here, (?:^|\s) is a non-capturing alternation group matching start of string *(^) or (|) a whitespace (\s), then a digit from 1 to 8 is captured (with ([1-8])) and then (?:$|\s) matches the end of string ($) or a whitespace. $match[1] holds the necessary output.

Upvotes: 0

Daren Chandisingh
Daren Chandisingh

Reputation: 2165

Try this:

preg_match("/( \d{1} )/", $input_line, $output_array);

Examples: http://www.phpliveregex.com/p/luf

Upvotes: 1

JParkinson1991
JParkinson1991

Reputation: 1286

Give the following preg_match a try

<?php

$matched = preg_match('/( [0-9] )/', $string, $matches);
if($matched){
    print_r($matches);
}

Hope this helps!

Upvotes: 2

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