Git diff: ignore lines starting with a word












1















As I have learned here, we can tell git diff to ignore lines starting with a * using:



git diff -G '^[[:space:]]*[^[:space:]*]'


How do I tell git to ignore lines starting with a word, or more (for example: * Generated at), not just a character?



This file shall be ignored, it contains only trivial changes:



- * Generated at 2018-11-21
+ * Generated at 2018-11-23


This file shall NOT be ignored, it contains NOT only trivial changes:



- * Generated at 2018-11-21
+ * Generated at 2018-11-23
+ * This line is important! Although it starts with a *









share|improve this question

























  • Probably a dupe of ignoring changes matching a string in git diff

    – Wiktor Stribiżew
    Nov 23 '18 at 18:30
















1















As I have learned here, we can tell git diff to ignore lines starting with a * using:



git diff -G '^[[:space:]]*[^[:space:]*]'


How do I tell git to ignore lines starting with a word, or more (for example: * Generated at), not just a character?



This file shall be ignored, it contains only trivial changes:



- * Generated at 2018-11-21
+ * Generated at 2018-11-23


This file shall NOT be ignored, it contains NOT only trivial changes:



- * Generated at 2018-11-21
+ * Generated at 2018-11-23
+ * This line is important! Although it starts with a *









share|improve this question

























  • Probably a dupe of ignoring changes matching a string in git diff

    – Wiktor Stribiżew
    Nov 23 '18 at 18:30














1












1








1








As I have learned here, we can tell git diff to ignore lines starting with a * using:



git diff -G '^[[:space:]]*[^[:space:]*]'


How do I tell git to ignore lines starting with a word, or more (for example: * Generated at), not just a character?



This file shall be ignored, it contains only trivial changes:



- * Generated at 2018-11-21
+ * Generated at 2018-11-23


This file shall NOT be ignored, it contains NOT only trivial changes:



- * Generated at 2018-11-21
+ * Generated at 2018-11-23
+ * This line is important! Although it starts with a *









share|improve this question
















As I have learned here, we can tell git diff to ignore lines starting with a * using:



git diff -G '^[[:space:]]*[^[:space:]*]'


How do I tell git to ignore lines starting with a word, or more (for example: * Generated at), not just a character?



This file shall be ignored, it contains only trivial changes:



- * Generated at 2018-11-21
+ * Generated at 2018-11-23


This file shall NOT be ignored, it contains NOT only trivial changes:



- * Generated at 2018-11-21
+ * Generated at 2018-11-23
+ * This line is important! Although it starts with a *






regex git git-diff






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share|improve this question













share|improve this question




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edited Nov 23 '18 at 18:40







sergej

















asked Nov 23 '18 at 18:26









sergejsergej

9,91542357




9,91542357













  • Probably a dupe of ignoring changes matching a string in git diff

    – Wiktor Stribiżew
    Nov 23 '18 at 18:30



















  • Probably a dupe of ignoring changes matching a string in git diff

    – Wiktor Stribiżew
    Nov 23 '18 at 18:30

















Probably a dupe of ignoring changes matching a string in git diff

– Wiktor Stribiżew
Nov 23 '18 at 18:30





Probably a dupe of ignoring changes matching a string in git diff

– Wiktor Stribiżew
Nov 23 '18 at 18:30












2 Answers
2






active

oldest

votes


















2














Considering you are ignoring changes that does NOT match your regex, you just have to put the words you want inside the expression within a lookahead capture group, like this:



git diff -G '^(?=.*Generated at)[[:space:]]*[^[:space:]*]'


Note that if you want to keep adding words to ignore, just keep adding these groups (don't forget the .*):
However, if the string contains a "Generated at" anywhere in their whole, it shall be ignored. If you want to define exactly how it should start, then replace the . with a [^[:word:]].



git diff -G '^(?=[^[:word:]]*Generated at)[[:space:]]*[^[:space:]*]'


You can have a look at it's behaviour at



Version 1: .*



https://regex101.com/r/kdv4V0/1



Version 2: [^[:word:]]*



https://regex101.com/r/kdv4V0/2






share|improve this answer
























  • Thanks for your answer. However, git version 2.7.4 seems not to support this regex, I am getting fatal: invalid regex: Invalid preceding regular expression.

    – sergej
    Nov 24 '18 at 10:20



















1














Git is using POSIX regular expressions which seem not to support lookarounds. That is the reason why @Myys 3's approach does not work. A not so elegant workaround could be something like this:



git diff -G '^s*([^s*]|*s*[^sG]|*sG[^e]|*sGe[^n]|*sGen[^e]|*sGene[^r]|*sGener[^a]|*sGenera[^t]|*sGenerat[^e]|*sGenerate[^d]).*'


This will filter out all changes starting with "* Generated".



Test: https://regex101.com/r/kdv4V0/3






share|improve this answer























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    2 Answers
    2






    active

    oldest

    votes








    2 Answers
    2






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    2














    Considering you are ignoring changes that does NOT match your regex, you just have to put the words you want inside the expression within a lookahead capture group, like this:



    git diff -G '^(?=.*Generated at)[[:space:]]*[^[:space:]*]'


    Note that if you want to keep adding words to ignore, just keep adding these groups (don't forget the .*):
    However, if the string contains a "Generated at" anywhere in their whole, it shall be ignored. If you want to define exactly how it should start, then replace the . with a [^[:word:]].



    git diff -G '^(?=[^[:word:]]*Generated at)[[:space:]]*[^[:space:]*]'


    You can have a look at it's behaviour at



    Version 1: .*



    https://regex101.com/r/kdv4V0/1



    Version 2: [^[:word:]]*



    https://regex101.com/r/kdv4V0/2






    share|improve this answer
























    • Thanks for your answer. However, git version 2.7.4 seems not to support this regex, I am getting fatal: invalid regex: Invalid preceding regular expression.

      – sergej
      Nov 24 '18 at 10:20
















    2














    Considering you are ignoring changes that does NOT match your regex, you just have to put the words you want inside the expression within a lookahead capture group, like this:



    git diff -G '^(?=.*Generated at)[[:space:]]*[^[:space:]*]'


    Note that if you want to keep adding words to ignore, just keep adding these groups (don't forget the .*):
    However, if the string contains a "Generated at" anywhere in their whole, it shall be ignored. If you want to define exactly how it should start, then replace the . with a [^[:word:]].



    git diff -G '^(?=[^[:word:]]*Generated at)[[:space:]]*[^[:space:]*]'


    You can have a look at it's behaviour at



    Version 1: .*



    https://regex101.com/r/kdv4V0/1



    Version 2: [^[:word:]]*



    https://regex101.com/r/kdv4V0/2






    share|improve this answer
























    • Thanks for your answer. However, git version 2.7.4 seems not to support this regex, I am getting fatal: invalid regex: Invalid preceding regular expression.

      – sergej
      Nov 24 '18 at 10:20














    2












    2








    2







    Considering you are ignoring changes that does NOT match your regex, you just have to put the words you want inside the expression within a lookahead capture group, like this:



    git diff -G '^(?=.*Generated at)[[:space:]]*[^[:space:]*]'


    Note that if you want to keep adding words to ignore, just keep adding these groups (don't forget the .*):
    However, if the string contains a "Generated at" anywhere in their whole, it shall be ignored. If you want to define exactly how it should start, then replace the . with a [^[:word:]].



    git diff -G '^(?=[^[:word:]]*Generated at)[[:space:]]*[^[:space:]*]'


    You can have a look at it's behaviour at



    Version 1: .*



    https://regex101.com/r/kdv4V0/1



    Version 2: [^[:word:]]*



    https://regex101.com/r/kdv4V0/2






    share|improve this answer













    Considering you are ignoring changes that does NOT match your regex, you just have to put the words you want inside the expression within a lookahead capture group, like this:



    git diff -G '^(?=.*Generated at)[[:space:]]*[^[:space:]*]'


    Note that if you want to keep adding words to ignore, just keep adding these groups (don't forget the .*):
    However, if the string contains a "Generated at" anywhere in their whole, it shall be ignored. If you want to define exactly how it should start, then replace the . with a [^[:word:]].



    git diff -G '^(?=[^[:word:]]*Generated at)[[:space:]]*[^[:space:]*]'


    You can have a look at it's behaviour at



    Version 1: .*



    https://regex101.com/r/kdv4V0/1



    Version 2: [^[:word:]]*



    https://regex101.com/r/kdv4V0/2







    share|improve this answer












    share|improve this answer



    share|improve this answer










    answered Nov 23 '18 at 20:06









    Myys 3Myys 3

    213




    213













    • Thanks for your answer. However, git version 2.7.4 seems not to support this regex, I am getting fatal: invalid regex: Invalid preceding regular expression.

      – sergej
      Nov 24 '18 at 10:20



















    • Thanks for your answer. However, git version 2.7.4 seems not to support this regex, I am getting fatal: invalid regex: Invalid preceding regular expression.

      – sergej
      Nov 24 '18 at 10:20

















    Thanks for your answer. However, git version 2.7.4 seems not to support this regex, I am getting fatal: invalid regex: Invalid preceding regular expression.

    – sergej
    Nov 24 '18 at 10:20





    Thanks for your answer. However, git version 2.7.4 seems not to support this regex, I am getting fatal: invalid regex: Invalid preceding regular expression.

    – sergej
    Nov 24 '18 at 10:20













    1














    Git is using POSIX regular expressions which seem not to support lookarounds. That is the reason why @Myys 3's approach does not work. A not so elegant workaround could be something like this:



    git diff -G '^s*([^s*]|*s*[^sG]|*sG[^e]|*sGe[^n]|*sGen[^e]|*sGene[^r]|*sGener[^a]|*sGenera[^t]|*sGenerat[^e]|*sGenerate[^d]).*'


    This will filter out all changes starting with "* Generated".



    Test: https://regex101.com/r/kdv4V0/3






    share|improve this answer




























      1














      Git is using POSIX regular expressions which seem not to support lookarounds. That is the reason why @Myys 3's approach does not work. A not so elegant workaround could be something like this:



      git diff -G '^s*([^s*]|*s*[^sG]|*sG[^e]|*sGe[^n]|*sGen[^e]|*sGene[^r]|*sGener[^a]|*sGenera[^t]|*sGenerat[^e]|*sGenerate[^d]).*'


      This will filter out all changes starting with "* Generated".



      Test: https://regex101.com/r/kdv4V0/3






      share|improve this answer


























        1












        1








        1







        Git is using POSIX regular expressions which seem not to support lookarounds. That is the reason why @Myys 3's approach does not work. A not so elegant workaround could be something like this:



        git diff -G '^s*([^s*]|*s*[^sG]|*sG[^e]|*sGe[^n]|*sGen[^e]|*sGene[^r]|*sGener[^a]|*sGenera[^t]|*sGenerat[^e]|*sGenerate[^d]).*'


        This will filter out all changes starting with "* Generated".



        Test: https://regex101.com/r/kdv4V0/3






        share|improve this answer













        Git is using POSIX regular expressions which seem not to support lookarounds. That is the reason why @Myys 3's approach does not work. A not so elegant workaround could be something like this:



        git diff -G '^s*([^s*]|*s*[^sG]|*sG[^e]|*sGe[^n]|*sGen[^e]|*sGene[^r]|*sGener[^a]|*sGenera[^t]|*sGenerat[^e]|*sGenerate[^d]).*'


        This will filter out all changes starting with "* Generated".



        Test: https://regex101.com/r/kdv4V0/3







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Nov 25 '18 at 21:04









        sergejsergej

        9,91542357




        9,91542357






























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