php regexp how to capture substring to variable

Question

In php if I capture a string

$string = 'gardens, countryside @teddy135'

how do I capture @username from that string to a new variable in php username begins with @ preceded by a space and terminating in a space or the end of the string?

so I would end up with

$string = 'gardens, countryside' $username ='@teddy135'

\s@(\w+)\b

Tushar
– Tushar

2015-12-18 06:20:33 +00:00
Commented Dec 18, 2015 at 6:20 — Tushar
– Tushar, Commented Dec 18, 2015 at 6:20
@Tushar you should post this as answer with explanation

Disha V.
– Disha V.

2015-12-18 06:21:23 +00:00
Commented Dec 18, 2015 at 6:21 — Disha V.
– Disha V., Commented Dec 18, 2015 at 6:21

Tushar · Accepted Answer · 2015-12-18 06:24:00Z

2

Use following regex

\s@(\w+)\b

Regex101 Demo

\s: Matches one space
@: Matches @ literally
(\w+): Matches one or more alphanumeric characters including _ and put it in first capturing group
\b: Word boundary

Code:

$re = "/\\s@(\\w+)\\b/"; 
$str = "gardens, countryside @teddy135 @tushar and @abc"; 

preg_match_all($re, $str, $matches);

edited Dec 18, 2015 at 6:24

answered Dec 18, 2015 at 6:22

Tushar

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5 Comments

Barry Hamilton Over a year ago

would that be like preg_match_all('\s@(\w+)\b',$string,$username);

Tushar Over a year ago

@BarryHamilton I've added code too at the bottom of answer

Barry Hamilton Over a year ago

cheers, I will accept when the window allows, you were very quick!

Barry Hamilton Over a year ago

array(2) { [0]=> string(10) " @teddy135" [1]=> string(8) "teddy135" } when I dump $matches it has captured it twice once with @ and once without?

Tushar Over a year ago

@BarryHamilton The one at index 1 is the first captured group, you can use $matches[1] to get the username, if you want @ symbol too, then use $matches[0]

Mayur Koshti · Accepted Answer · 2015-12-18 06:33:28Z

0

$regex = "/\s(@\S+)/"; 
$mystr = "gardens, countryside @teddy135 @xyz-12 and @abc.abc"; 

preg_match_all($regex, $mystr, $matches);
print_r($matches);

answered Dec 18, 2015 at 6:33

Mayur Koshti

1,89218 silver badges21 bronze badges

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