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Regular Expression to match against first character and file extension
The Next CEO of Stack OverflowIs there a regular expression to detect a valid regular expression?How to validate an email address using a regular expression?Regular expression to match a line that doesn't contain a word?How do you access the matched groups in a JavaScript regular expression?Regular Expressions: Is there an AND operator?How do you use a variable in a regular expression?Can you provide some examples of why it is hard to parse XML and HTML with a regex?Regular expression to stop at first matchHow to match “anything up until this sequence of characters” in a regular expression?Regular expression for matching account numbers
I'm using Bash to try to write a command that gets every file where the first character is not 'a' and the file does not end with '.html' but cannot seem to get both to work properly.
So far I can get my regex to match all the files that start with 'a' and end with '.html' and remove them but my issue that I cannot seem to solve is when the file starts with 'a' and ends with a different file extension. My regex seems to ignore that second requirement and just hides it regardless.
cat inputfile.txt | sed -n '/^[^a].*[^html$]/p'
Input File Contents:
123
anapple.html
456
theapple.html
789
nottrue.html
apple.csv
12
Output:
123
456
theapple.html
789
nottrue.html
12
regex regex-negation
asked Mar 8 at 16:11
ExhoExho
391
add a comment |
I'm using Bash to try to write a command that gets every file where the first character is not 'a' and the file does not end with '.html' but cannot seem to get both to work properly.
So far I can get my regex to match all the files that start with 'a' and end with '.html' and remove them but my issue that I cannot seem to solve is when the file starts with 'a' and ends with a different file extension. My regex seems to ignore that second requirement and just hides it regardless.
cat inputfile.txt | sed -n '/^[^a].*[^html$]/p'
Input File Contents:
123
anapple.html
456
theapple.html
789
nottrue.html
apple.csv
12
Output:
123
456
theapple.html
789
nottrue.html
12
regex regex-negation
asked Mar 8 at 16:11
ExhoExho
391
1
You need to review a regexp tutorial to find out what[^html$]means. It's a single character that's noth,t,m,l, or$.
– Barmar
Mar 8 at 16:14
also the$shouldn't be inside the[]if you meant the end of the string
– Kaddath
Mar 8 at 16:15
add a comment |
I'm using Bash to try to write a command that gets every file where the first character is not 'a' and the file does not end with '.html' but cannot seem to get both to work properly.
So far I can get my regex to match all the files that start with 'a' and end with '.html' and remove them but my issue that I cannot seem to solve is when the file starts with 'a' and ends with a different file extension. My regex seems to ignore that second requirement and just hides it regardless.
cat inputfile.txt | sed -n '/^[^a].*[^html$]/p'
Input File Contents:
123
anapple.html
456
theapple.html
789
nottrue.html
apple.csv
12
Output:
123
456
theapple.html
789
nottrue.html
12
regex regex-negation
asked Mar 8 at 16:11
ExhoExho
391
I'm using Bash to try to write a command that gets every file where the first character is not 'a' and the file does not end with '.html' but cannot seem to get both to work properly.
So far I can get my regex to match all the files that start with 'a' and end with '.html' and remove them but my issue that I cannot seem to solve is when the file starts with 'a' and ends with a different file extension. My regex seems to ignore that second requirement and just hides it regardless.
cat inputfile.txt | sed -n '/^[^a].*[^html$]/p'
Input File Contents:
123
anapple.html
456
theapple.html
789
nottrue.html
apple.csv
12
Output:
123
456
theapple.html
789
nottrue.html
12
regex regex-negation
regex regex-negation
asked Mar 8 at 16:11
ExhoExho
391
asked Mar 8 at 16:11
ExhoExho
391
asked Mar 8 at 16:11
ExhoExho
391
asked Mar 8 at 16:11
ExhoExho
391
asked Mar 8 at 16:11
ExhoExho
391
391
1
You need to review a regexp tutorial to find out what[^html$]means. It's a single character that's noth,t,m,l, or$.
– Barmar
Mar 8 at 16:14
also the$shouldn't be inside the[]if you meant the end of the string
– Kaddath
Mar 8 at 16:15
add a comment |
1
You need to review a regexp tutorial to find out what[^html$]means. It's a single character that's noth,t,m,l, or$.
– Barmar
Mar 8 at 16:14
also the$shouldn't be inside the[]if you meant the end of the string
– Kaddath
Mar 8 at 16:15
1
1
You need to review a regexp tutorial to find out what
[^html$] means. It's a single character that's not h, t, m, l, or $.– Barmar
Mar 8 at 16:14
You need to review a regexp tutorial to find out what
[^html$] means. It's a single character that's not h, t, m, l, or $.– Barmar
Mar 8 at 16:14
also the
$ shouldn't be inside the [] if you meant the end of the string– Kaddath
Mar 8 at 16:15
also the
$ shouldn't be inside the [] if you meant the end of the string– Kaddath
Mar 8 at 16:15
add a comment |
1 Answer
1
active
oldest
votes
Instead of trying to write a pattern that matches the rows to keep, write a pattern that matches the rows to remove, and use grep -v to print all the lines that don't match it.
grep -v '^a.*.html$' inputfile.txt
answered Mar 8 at 16:18
BarmarBarmar
434k36259362
add a comment |
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Instead of trying to write a pattern that matches the rows to keep, write a pattern that matches the rows to remove, and use grep -v to print all the lines that don't match it.
grep -v '^a.*.html$' inputfile.txt
answered Mar 8 at 16:18
BarmarBarmar
434k36259362
add a comment |
Instead of trying to write a pattern that matches the rows to keep, write a pattern that matches the rows to remove, and use grep -v to print all the lines that don't match it.
grep -v '^a.*.html$' inputfile.txt
answered Mar 8 at 16:18
BarmarBarmar
434k36259362
add a comment |
Instead of trying to write a pattern that matches the rows to keep, write a pattern that matches the rows to remove, and use grep -v to print all the lines that don't match it.
grep -v '^a.*.html$' inputfile.txt
answered Mar 8 at 16:18
BarmarBarmar
434k36259362
Instead of trying to write a pattern that matches the rows to keep, write a pattern that matches the rows to remove, and use grep -v to print all the lines that don't match it.
grep -v '^a.*.html$' inputfile.txt
answered Mar 8 at 16:18
BarmarBarmar
434k36259362
answered Mar 8 at 16:18
BarmarBarmar
434k36259362
answered Mar 8 at 16:18
BarmarBarmar
434k36259362
answered Mar 8 at 16:18
BarmarBarmar
434k36259362
434k36259362
add a comment |
add a comment |
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You need to review a regexp tutorial to find out what
[^html$]means. It's a single character that's noth,t,m,l, or$.– Barmar
Mar 8 at 16:14
also the
$shouldn't be inside the[]if you meant the end of the string– Kaddath
Mar 8 at 16:15