Regular Expressions Negation String

Question

I want a regular expression to find all the tr tags that do not contain td

<tr asdf>
<td>
<hello>
</td>
</tr>
<tr asdf>
</tr>

I only want the bottom 2 lines in the code to be found. Here is the template of the regular expression:

<tr.*?>(Cannot figure this section out)</tr>

[Another day, another poor soul trying to parse HTML with regex.](http://stackoverflow.com/a/1732454/399649) :) — Justin Morgan - On strike, Oct 14 '14 at 16:15

Casimir et Hippolyte · Accepted Answer · 2014-10-14T16:10:55.767

2

You can use this kind of pattern:

<tr[^>]*>(?>[^<]+|<(?!td\b|/tr>))*</tr>

Pattern description:

<tr[^>]*>          # a tr tag with whatever you want inside
(?>                # open an atomic group (like a non-capturing
                   # group but forbids backtracking once it is closed)
    [^<]+          # all that is not a <
  |                # OR
    <(?!td\b|/tr>) # a < not followed by td or /tr>
)*                 # zero or more times
</tr>

or this one (slower, most of the time):

(?s)<tr[^>]*>(?:(?!<td\b).)*?</tr>

edited Oct 14 '14 at 16:10

answered Oct 14 '14 at 16:05

Casimir et Hippolyte

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@developer234: however, note that these two patterns don't work if you have nested tr tags. – Casimir et Hippolyte Oct 14 '14 at 16:15
@AvinashRaj: There are many different situations with which you need to deal and that needs reflexion, but the reflexion stops where the dogma begins. – Casimir et Hippolyte Oct 14 '14 at 16:27

score 0 · Answer 2 · answered Oct 14 '14 at 16:12

0

<tr[^>]*>((?!<\/tr>|<td>|<\/td>).)*<\/tr>

Try this.Set g and s flag.See demo.

http://regex101.com/r/uH3tP3/12

answered Oct 14 '14 at 16:12

vks

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Regular Expressions Negation String

2 Answers2