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Resolved How to insert matching part in a replacement of a regular expression

  1. mawe
    mawe
  2. RO CSVI
  3. Wednesday, 20 December 2017
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Hi

I try to find image file names (four digits, filetype .png) and do a replace to build a complete img-tag.

My Problem: I don't know how to insert the matching string (found filename) in the replacement part of the rule.

I tryed \1 but it doesn't work.

Regards

Martin
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Responses (3)
rolandd
rolandd
Accepted Answer Pending Moderation
Hello Martin,

You may need to use \\1 instead of \1. Did you try that? I am no guru with regular expressions either ;)
Kind regards,

RolandD

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  1. more than a month ago
  2. RO CSVI
  3. # 1
mawe
mawe
Accepted Answer Pending Moderation
Hello Roland

The suggested solution with doubling the backslashes did not work. But after "playing around" for a while with the regex, I read the decisive sentence in the PHP documentation:

"However, if the decimal number following the backslash is less than 10, it is always taken as a back reference, and causes an error only if there are not that many capturing left parentheses in the entire pattern. "

So I added some parentheses in my find term

Find: /(\d{4}.png)/

Replace: \1

- and it worked!

Greetings from Switzerland

Martin
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  1. more than a month ago
  2. RO CSVI
  3. # 2
rolandd
rolandd
Accepted Answer Pending Moderation
Hello Martin,

Thank you for posting your solution.
Kind regards,

RolandD

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  1. more than a month ago
  2. RO CSVI
  3. # 3
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