(continuing Re^2: In place replace, ignoring between quotes (one regex))

this should handle single and double quotes and escaping

  DB<145> p $s3=q{ "no" yo \\' yo ' no \\\\\\' no ' yo } 
 "no" yo \' yo ' no \\\' no ' yo

  DB<146> $_=$s3;  s/ ( \\. | ' (?: \\.|[^'] )* ' | " (?: \\.|[^"] )* 
+" ) | o /  $1 or 'O' /xge ; 
 => 6

  DB<147> p $_
 "no" yO \' yO ' no \\\' no ' yO

[download]

If escapes outside of quotes should be ignored depends on the use-case, otherwise just skip the first or-case.

of course both quote-cases can be joined:

  DB<148> $_=$s3;  s/ ( \\. | (['"]) (?: \\.|[^\2] )* \2 ) | o /  $1 o
+r 'O' /xge ; 
 => 6

  DB<149> p $_
 "no" yO \' yO ' no \\\' no ' yO

[download]

I think it's a good example to show how the regex engine does backtracking! =)

update

maybe easier to reuse with non-greedy quantifier 

  DB<110> $_=$s3;  s/ ( \\. | (['"]) (?: \\.|. )*? \2 ) | o /  $1 or '
+O' /xge ; print ; ()
 "no'" yO \' yO ' no \\\' no ' yO

[download]

Cheers Rolf

( addicted to the Perl Programming Language)

In reply to Re^2: In place replace, ignoring between quotes (escapes) by LanX
in thread In place replace, ignoring between quotes by Klainn

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.