PHP preg_replace not working as intended in this code

Question

My intention is to remove any attribute which does not have value.

Here is my Code:

<?php
$srcTxt = "
|title=
|Row18={{Timeline row
  |from=
  |to=2000
  |1-text= TYRR consolidation
  |1-at= 1904
  |2-text= TYRR and TFC takeover
  |2-at= 1927
  |3-text= private bus services acquisition
  |3-at= 1954
|Row18={{Scale row|
  |from=1840
  |to=2000
  |increment=40
  }}
}} ";

$srcTxt = preg_replace("/^ *.*= *$/m", "", $srcTxt);

echo ($srcTxt);

?>

The expected output is to remove |title= and |from= which do not have any values assigned to them.

This works perfectly here But not so when I run it locally in my system. What might be the issue?

Does it replace nothing or only the first occurence (|title=) when you run it on your system? — KeyNone
– KeyNone, Commented Jan 2, 2014 at 13:45
@BastiM Nothing changes in the output. Not even the first |title... — Jayarathina Madharasan
– Jayarathina Madharasan, Commented Jan 2, 2014 at 13:46
Just tried it and it works correctly (PHP 5.4.4-14+deb7u2). What version do you run? — Mike S.
– Mike S., Commented Jan 2, 2014 at 13:47
@JayarathinaMadharasan: I'm unable to reproduce this issue. It works fine. Can you show the output you're getting now and the expected output? — Amal
– Amal, Commented Jan 2, 2014 at 13:47

revo · Accepted Answer · 2014-01-02 14:05:30Z

1

<?php
$srcTxt = "
|title=
|Row18={{Timeline row
  |from=
  |to=2000
  |1-text= TYRR consolidation
  |1-at= 1904
  |2-text= TYRR and TFC takeover
  |2-at= 1927
  |3-text= private bus services acquisition
  |3-at= 1954
|Row18={{Scale row|
  |from=1840
  |to=2000
  |increment=40
  }}
}} ";

$srcTxt = trim(preg_replace("/(.+?)=\s*\n/", '', $srcTxt));
echo $srcTxt ;

Output:

|Row18={{Timeline row
  |to=2000
  |1-text= TYRR consolidation
  |1-at= 1904
  |2-text= TYRR and TFC takeover
  |2-at= 1927
  |3-text= private bus services acquisition
  |3-at= 1954
|Row18={{Scale row|
  |from=1840
  |to=2000
  |increment=40
  }}
}}

answered Jan 2, 2014 at 14:05

revo

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2 Comments

Jayarathina Madharasan Over a year ago

+1 Thanks a lot... That code works... :) But I am still curious why my code did not work.

revo Over a year ago

@JayarathinaMadharasan Your snippet doesn't work on my localhost either, and I found that this issue is due to white spaces which I managed in the regex correctly. I didn't go deep to find the answer but.

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