Regular expression - Combine positive & negative lookaheadNotepad++ regular expression helpNon-greedy...

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Regular expression - Combine positive & negative lookahead


Notepad++ regular expression helpNon-greedy regular expression in edNotepad++ Regular Expression AssistanceRegex positive lookahead when lookahead data doesn't exist (PCRE)Regular Expression - rename picturesRegular expression for deleting duplicated filesregular expression not matching partially a stringRegular expressioncombine several regexes with negative and positive lookaheadregular expression MS Word






.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ height:90px;width:728px;box-sizing:border-box;
}







1















I have basic knowledge in regex but not when it comes to lookaheads :-)

I have the following example:



<DIV style="overflow: hidden; border-bottom: 1px Solid rgb(192,192,192); position: absolute; left: 5821px; top: 22px; width: 1200px; height: 166px; "><DIV ID="s32" style="position: absolute; left: 8px; top: 2px; width: 1185px; height: 162px; " >
¤&lt;h1&gt;Some text within h1 tags.&lt;/h1&gt;&lt;<br>¤¤</DIV></DIV>

<DIV style="overflow: hidden; border-bottom: 1px Solid rgb(192,192,192); position: absolute; left: 5821px; top: 22px; width: 1200px; height: 166px; "><DIV ID="s33" style="position: absolute; left: 8px; top: 2px; width: 1185px; height: 162px; " >
&lt;h1&gt;Some text within h1 tags.&lt;/h1&gt;&lt;<br></DIV></DIV>

<DIV style="overflow: hidden; border-bottom: 1px Solid rgb(192,192,192); position: absolute; left: 5821px; top: 22px; width: 1200px; height: 166px; "><DIV ID="s32" style="position: absolute; left: 8px; top: 2px; width: 1185px; height: 162px; " >
¤&lt;h1&gt;Some text within h1 tags.&lt;/h1&gt;&lt;<br>¤¤</DIV></DIV>

<DIV style="overflow: hidden; border-bottom: 1px Solid rgb(192,192,192); position: absolute; left: 5821px; top: 22px; width: 1200px; height: 166px; "><DIV ID="s33" style="position: absolute; left: 8px; top: 2px; width: 1185px; height: 162px; " >
&lt;h1&gt;Some text within h1 tags.&lt;/h1&gt;&lt;<br></DIV></DIV>


I only want the text within div id s32 to match. I'm experimenting with a positive lookahead first to se if I can get at least that part right but while



(?<="s32".+)Some text


does work, this one



(?<="s32".+¤¤)Some text


doesn't...



I'm trying to understand why I don't get any match on this? With the above example I expected to get 3 matches. Once I understand this I could experiment with a negative lookahead that would then hopefully only give 2 matches (within the s32 DIVs).



Any advice and explanation is welcome as I'm currently a little bit lost :-)










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  • What language/tool are you using? Variable length look behind is not handle by many regex flavour.

    – Toto
    yesterday











  • Hi Toto. I'm using a tool called RegEx Tester V3.2.0.0 and only use this tool to perform search and replace actions on source code which I then export. If there is a better tool that you would recommend me to look at then I'm more than happy to do so.

    – user3624244
    yesterday


















1















I have basic knowledge in regex but not when it comes to lookaheads :-)

I have the following example:



<DIV style="overflow: hidden; border-bottom: 1px Solid rgb(192,192,192); position: absolute; left: 5821px; top: 22px; width: 1200px; height: 166px; "><DIV ID="s32" style="position: absolute; left: 8px; top: 2px; width: 1185px; height: 162px; " >
¤&lt;h1&gt;Some text within h1 tags.&lt;/h1&gt;&lt;<br>¤¤</DIV></DIV>

<DIV style="overflow: hidden; border-bottom: 1px Solid rgb(192,192,192); position: absolute; left: 5821px; top: 22px; width: 1200px; height: 166px; "><DIV ID="s33" style="position: absolute; left: 8px; top: 2px; width: 1185px; height: 162px; " >
&lt;h1&gt;Some text within h1 tags.&lt;/h1&gt;&lt;<br></DIV></DIV>

<DIV style="overflow: hidden; border-bottom: 1px Solid rgb(192,192,192); position: absolute; left: 5821px; top: 22px; width: 1200px; height: 166px; "><DIV ID="s32" style="position: absolute; left: 8px; top: 2px; width: 1185px; height: 162px; " >
¤&lt;h1&gt;Some text within h1 tags.&lt;/h1&gt;&lt;<br>¤¤</DIV></DIV>

<DIV style="overflow: hidden; border-bottom: 1px Solid rgb(192,192,192); position: absolute; left: 5821px; top: 22px; width: 1200px; height: 166px; "><DIV ID="s33" style="position: absolute; left: 8px; top: 2px; width: 1185px; height: 162px; " >
&lt;h1&gt;Some text within h1 tags.&lt;/h1&gt;&lt;<br></DIV></DIV>


I only want the text within div id s32 to match. I'm experimenting with a positive lookahead first to se if I can get at least that part right but while



(?<="s32".+)Some text


does work, this one



(?<="s32".+¤¤)Some text


doesn't...



I'm trying to understand why I don't get any match on this? With the above example I expected to get 3 matches. Once I understand this I could experiment with a negative lookahead that would then hopefully only give 2 matches (within the s32 DIVs).



Any advice and explanation is welcome as I'm currently a little bit lost :-)










share|improve this question









New contributor




user3624244 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





















  • What language/tool are you using? Variable length look behind is not handle by many regex flavour.

    – Toto
    yesterday











  • Hi Toto. I'm using a tool called RegEx Tester V3.2.0.0 and only use this tool to perform search and replace actions on source code which I then export. If there is a better tool that you would recommend me to look at then I'm more than happy to do so.

    – user3624244
    yesterday














1












1








1








I have basic knowledge in regex but not when it comes to lookaheads :-)

I have the following example:



<DIV style="overflow: hidden; border-bottom: 1px Solid rgb(192,192,192); position: absolute; left: 5821px; top: 22px; width: 1200px; height: 166px; "><DIV ID="s32" style="position: absolute; left: 8px; top: 2px; width: 1185px; height: 162px; " >
¤&lt;h1&gt;Some text within h1 tags.&lt;/h1&gt;&lt;<br>¤¤</DIV></DIV>

<DIV style="overflow: hidden; border-bottom: 1px Solid rgb(192,192,192); position: absolute; left: 5821px; top: 22px; width: 1200px; height: 166px; "><DIV ID="s33" style="position: absolute; left: 8px; top: 2px; width: 1185px; height: 162px; " >
&lt;h1&gt;Some text within h1 tags.&lt;/h1&gt;&lt;<br></DIV></DIV>

<DIV style="overflow: hidden; border-bottom: 1px Solid rgb(192,192,192); position: absolute; left: 5821px; top: 22px; width: 1200px; height: 166px; "><DIV ID="s32" style="position: absolute; left: 8px; top: 2px; width: 1185px; height: 162px; " >
¤&lt;h1&gt;Some text within h1 tags.&lt;/h1&gt;&lt;<br>¤¤</DIV></DIV>

<DIV style="overflow: hidden; border-bottom: 1px Solid rgb(192,192,192); position: absolute; left: 5821px; top: 22px; width: 1200px; height: 166px; "><DIV ID="s33" style="position: absolute; left: 8px; top: 2px; width: 1185px; height: 162px; " >
&lt;h1&gt;Some text within h1 tags.&lt;/h1&gt;&lt;<br></DIV></DIV>


I only want the text within div id s32 to match. I'm experimenting with a positive lookahead first to se if I can get at least that part right but while



(?<="s32".+)Some text


does work, this one



(?<="s32".+¤¤)Some text


doesn't...



I'm trying to understand why I don't get any match on this? With the above example I expected to get 3 matches. Once I understand this I could experiment with a negative lookahead that would then hopefully only give 2 matches (within the s32 DIVs).



Any advice and explanation is welcome as I'm currently a little bit lost :-)










share|improve this question









New contributor




user3624244 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.












I have basic knowledge in regex but not when it comes to lookaheads :-)

I have the following example:



<DIV style="overflow: hidden; border-bottom: 1px Solid rgb(192,192,192); position: absolute; left: 5821px; top: 22px; width: 1200px; height: 166px; "><DIV ID="s32" style="position: absolute; left: 8px; top: 2px; width: 1185px; height: 162px; " >
¤&lt;h1&gt;Some text within h1 tags.&lt;/h1&gt;&lt;<br>¤¤</DIV></DIV>

<DIV style="overflow: hidden; border-bottom: 1px Solid rgb(192,192,192); position: absolute; left: 5821px; top: 22px; width: 1200px; height: 166px; "><DIV ID="s33" style="position: absolute; left: 8px; top: 2px; width: 1185px; height: 162px; " >
&lt;h1&gt;Some text within h1 tags.&lt;/h1&gt;&lt;<br></DIV></DIV>

<DIV style="overflow: hidden; border-bottom: 1px Solid rgb(192,192,192); position: absolute; left: 5821px; top: 22px; width: 1200px; height: 166px; "><DIV ID="s32" style="position: absolute; left: 8px; top: 2px; width: 1185px; height: 162px; " >
¤&lt;h1&gt;Some text within h1 tags.&lt;/h1&gt;&lt;<br>¤¤</DIV></DIV>

<DIV style="overflow: hidden; border-bottom: 1px Solid rgb(192,192,192); position: absolute; left: 5821px; top: 22px; width: 1200px; height: 166px; "><DIV ID="s33" style="position: absolute; left: 8px; top: 2px; width: 1185px; height: 162px; " >
&lt;h1&gt;Some text within h1 tags.&lt;/h1&gt;&lt;<br></DIV></DIV>


I only want the text within div id s32 to match. I'm experimenting with a positive lookahead first to se if I can get at least that part right but while



(?<="s32".+)Some text


does work, this one



(?<="s32".+¤¤)Some text


doesn't...



I'm trying to understand why I don't get any match on this? With the above example I expected to get 3 matches. Once I understand this I could experiment with a negative lookahead that would then hopefully only give 2 matches (within the s32 DIVs).



Any advice and explanation is welcome as I'm currently a little bit lost :-)







regex






share|improve this question









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Check out our Code of Conduct.











share|improve this question









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user3624244 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









share|improve this question




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edited 6 hours ago









zx485

1,4732914




1,4732914






New contributor




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asked yesterday









user3624244user3624244

61




61




New contributor




user3624244 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





New contributor





user3624244 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






user3624244 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.













  • What language/tool are you using? Variable length look behind is not handle by many regex flavour.

    – Toto
    yesterday











  • Hi Toto. I'm using a tool called RegEx Tester V3.2.0.0 and only use this tool to perform search and replace actions on source code which I then export. If there is a better tool that you would recommend me to look at then I'm more than happy to do so.

    – user3624244
    yesterday



















  • What language/tool are you using? Variable length look behind is not handle by many regex flavour.

    – Toto
    yesterday











  • Hi Toto. I'm using a tool called RegEx Tester V3.2.0.0 and only use this tool to perform search and replace actions on source code which I then export. If there is a better tool that you would recommend me to look at then I'm more than happy to do so.

    – user3624244
    yesterday

















What language/tool are you using? Variable length look behind is not handle by many regex flavour.

– Toto
yesterday





What language/tool are you using? Variable length look behind is not handle by many regex flavour.

– Toto
yesterday













Hi Toto. I'm using a tool called RegEx Tester V3.2.0.0 and only use this tool to perform search and replace actions on source code which I then export. If there is a better tool that you would recommend me to look at then I'm more than happy to do so.

– user3624244
yesterday





Hi Toto. I'm using a tool called RegEx Tester V3.2.0.0 and only use this tool to perform search and replace actions on source code which I then export. If there is a better tool that you would recommend me to look at then I'm more than happy to do so.

– user3624244
yesterday










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