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  1. <?php
  2.  
  3. echo PCRE_VERSION;
  4.  
  5. var_dump(preg_match('/\k/', 'foo'));
  6. var_dump(preg_match('/\g/', 'foo')); 
  7.  
  8.  
Success #stdin #stdout #stderr 0.02s 52488KB
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stdin
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Standard input is empty
stdout
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8.35 2014-04-04bool(false)
bool(false)
stderr
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PHP Warning:  preg_match(): Compilation failed: \k is not followed by a braced, angle-bracketed, or quoted name at offset 2 in /home/dK6CoO/prog.php on line 5
PHP Warning:  preg_match(): Compilation failed: a numbered reference must not be zero at offset 1 in /home/dK6CoO/prog.php on line 6
https://ideone.com/ROhTR7
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
public

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