How to get the words that start with '#' in string using php?

Question

I have this sentence

"My name's #jeff,what is thy name?"

And now i want to get #jeff from this sentence. I have tried this code

for ($i=0; $i <=substr_count($Text,'#'); $i++) { 
    $a=explode('#', $Text);
    echo $a[$i];
}

But it returns #jeff,what is thy name? which is not what my soul desires

Mohammad · Accepted Answer · 2016-11-05T18:32:38.340

6

There is simpler solution to do it. Use preg_match() that find target part of string using regex.

preg_match("/#\w+/", $str, $matches);
echo $matches[0]

Check result of code in demo

If you want to get all matches string, use preg_match_all() that find all matches.

preg_match_all("/#\w+/", $str, $matches);
print_r($matches[0]);

edited Nov 05 '16 at 18:32

answered Nov 05 '16 at 18:16

Mohammad

21,175
15
55
84

What if there are two '#'?I tried `echo $matches[$i];` but did not work. – Papaa Nov 05 '16 at 18:22
Try: `var_dump($matches)` to see what the result looks like. – M. Eriksson Nov 05 '16 at 18:23
@MagnusEriksson sentence:`#Save #thy #selves`. results:`array(1) { [0]=> string(5) "#Save" }` – Papaa Nov 05 '16 at 18:24
`preg_match()` quits after finding its first match.. – Xorifelse Nov 05 '16 at 18:25
If string has multiple matches, use `preg_match_all()`. See https://3v4l.org/GPjkc – Mohammad Nov 05 '16 at 18:25
Thanks for the answer! – Papaa Nov 05 '16 at 18:27

Xorifelse · Answer 2 · 2016-11-05T20:22:10.183

2

Personally I would not capture the word with #, since a hashtag is only an identifier for your code to get the attached word.

$re = '/(?<!\S)#([A-Za-z_][\w_]*)/';
$str = "My name's #jeff,what #0is #thy name?";

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

// Print the entire match result
print_r($matches[0]); // #jeff, #thy
print_r($matches[1]); // jeff, thy

By the rules of hashtags, it may not start with a digit but may contain them.

edited Nov 05 '16 at 20:22

answered Nov 05 '16 at 18:18

Xorifelse

7,878
1
27
38

1

Note that `(?:^|\s)` can be replaced with `(?<!\S)` – Casimir et Hippolyte Nov 05 '16 at 20:13
@CasimiretHippolyte I really didn't think of using a negative lookbehind, good catch. – Xorifelse Nov 05 '16 at 20:26

How to get the words that start with '#' in string using php?

2 Answers2