Convert Javascript Regular Expression to PHP (PCRE) Expression
- by Matt
Hi all,
I am up to my neck in regular expressions, and I have this regular expression that works in javascript (and flash) that I just can't get working in PHP
Here it is:
var number
= '(?:-?\\b(?:0|[1-9][0-9]*)(?:\\.[0-9]+)?(?:[eE][+-]?[0-9]+)?\\b)';
var oneChar = '(?:[^\\0-\\x08\\x0a-\\x1f\"\\\\]'
+ '|\\\\(?:[\"/\\\\bfnrt]|u[0-9A-Fa-f]{4}))';
var str = '(?:\"' + oneChar + '*\")';
var varName = '\\$(?:' + oneChar + '[^ ,]*)';
var func = '(?:{[ ]*' + oneChar + '[^ ]*)';
// Will match a value in a well-formed JSON file.
// If the input is not well-formed, may match strangely, but not in an unsafe
// way.
// Since this only matches value tokens, it does not match whitespace, colons,
// or commas.
var jsonToken = new RegExp(
'(?:false|true|null'
+'|[\\}]'
+ '|' + varName
+ '|' + func
+ '|' + number
+ '|' + str
+ ')', 'g');
If you want it fully assembled here it is:
/(?:false|true|null|[\}]|\$(?:(?:[^\0-\x08\x0a-\x1f"\\]|\\(?:["/\\bfnrt]|u[0-9A-Fa-f]{4}))[^ ,]*)|(?:{[ ]*(?:[^\0-\x08\x0a-\x1f"\\]|\\(?:["/\\bfnrt]|u[0-9A-Fa-f]{4}))[^ ]*)|(?:-?\b(?:0|[1-9][0-9]*)(?:\.[0-9]+)?(?:[eE][+-]?[0-9]+)?\b)|(?:"(?:[^\0-\x08\x0a-\x1f"\\]|\\(?:["/\\bfnrt]|u[0-9A-Fa-f]{4}))*"))/g
Interestingly enough, its very similar to JSON.
I need this regular expression to work in PHP...
Here's what I have in PHP:
$number = '(?:-?\\b(?:0|[1-9][0-9]*)(?:\\.[0-9]+)?(?:[eE][+-]?[0-9]+)?\\b)';
$oneChar = '(?:[^\\0-\\x08\\x0a-\\x1f\"\\\\]|\\\\(?:[\"/\\\\bfnrt]|u[0-9A-Fa-f]{4}))';
$string = '(?:\"'.$oneChar.'*\")';
$varName = '\\$(?:'.$oneChar.'[^ ,]*)';
$func = '(?:{[ ]*'.$oneChar.'[^ ]*)';
$jsonToken = '(?:false|true|null'
.'|[\\}]'
.'|'.$varName
.'|'.$func
.'|'.$number
.'|'.$string
.')';
echo $jsonToken;
preg_match_all($jsonToken, $content, $out);
return $out;
Here's what happens if I try using preg_match_all():
Warning: preg_match_all()
[function.preg-match-all]: Compilation
failed: nothing to repeat at offset 0
in
/Users/Matt/Sites/Templating/json/Jeeves.php
on line 88
Any help would be much appreciated!
Thanks,
Matt
