Python regex: how to replace string except if another string exist on the same line?

Question

I am fixing the spell of some articles withreplace.pyby replacing "choeur" by "chœur".
There are also file links in the mediawiki syntax :

[[Fichier:Menditte (Pyr-Atl, Fr) choeur de l'église.JpG|thumb|Chœur de l'église]]

Editing that kind of thing will broke the link. I can't use [] because there's also the link description :

[[Fichier:JeronimosRoyalTombs.Jpg|thumb|right|Tombeaux de [[Jean III de Portugal]] (à gauche) et de [[Catherine de Castille]] (à droite) dans la choeur de l'église]]

In that case, the spell should be fixed.
So I need to not do the edit if there is.jpgon the same line and after "choeur".

My problem is I couldn't find the way to handle boolean expressions inside python regex

Casimir et Hippolyte · Accepted Answer · 2014-05-30T14:00:01.043

1

You can use a negative lookahead (?!...) (not followed by):

pattern:

(?i)\b(ch)oe(urs?\b)(?!.*\.jpg\b)

replacement:

$1œ$2

About word boundaries:

Word boundaries are used to delimite letters for \bchoeurs?\b or \.jpg\b, and would do the job in most cases. However, keep in mind that the word boundaries will not work with this string: __choeur__. If needed, word boundaries can be replaced with lookarounds, example:

(?:(?<=_)|\b)choeurs?(?=_|\b)

edited May 30 '14 at 14:00

answered May 30 '14 at 00:46

Casimir et Hippolyte

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It don't work. `# python replace.py -namespace:0 -recursive -summary:"test" -xml:../frwiki-latest-pages-articles.xml -regex "(?i)\b(ch)oe(urs?\b)(?![^][|]*\.jpg[][|])" "chœur"` `bash: ![^][: event not found` – user2284570 May 30 '14 at 00:53
@user2284570: Try to use double backslashes `\\b` `\\.` – Casimir et Hippolyte May 30 '14 at 00:57
It can't work if you don't use `.*` before `jpg`. It suppose `jpg` immediately follow the string, which is the case in my example, but most of the time, it is not. – user2284570 May 30 '14 at 12:52
@user2284570: `choeur [[Fichier:choeur aaaa.jpg|......]]`: in this example, must the first "choeur" be replaced? – Casimir et Hippolyte May 30 '14 at 13:04
@user2284570: Ok, If I understand well there is no limit until the end of the line. – Casimir et Hippolyte May 30 '14 at 13:23

Python regex: how to replace string except if another string exist on the same line?

1 Answers1