Tagged Questions
1
vote
2answers
86 views
Regex and piped commands with sed
I'm finding really hard to use sed command, plus I can't seem to find well written tutorials.
Let me say that I worked with regular expression in other languages (Python, JavaScript, Java), so that ...
0
votes
1answer
45 views
Help with understanding a regular expression
I have this regular expression \\..\\{3\\}$
I want to understand how this expression works to match a string. My thought is that it matches any 8 characters at the end of the line. Is that how this ...
3
votes
2answers
118 views
How to add a line in many files
I have many .html files and I need to add a meta tag after <head>'s start tag in each file.
How I can do that?
Can vim help me?
0
votes
1answer
259 views
Remove a block of lines between two patterns [duplicate]
Possible Duplicate:
Show only text between 2 matching pattern
In a bash script using sed how can I remove a block of lines beginning with -pattern a- and ending with -pattern b- where the ...
1
vote
4answers
336 views
Replace text between brackets
I'm using awk '{ gsub(/BAR|WIBBLE/, "FOO"); print }' to replace text in data like:
SOMETHING [BAR, WIBBLE]
SOMETHING [BAR]
This gives the desired result of:
SOMETHING [FOO, FOO]
SOMETHING [FOO]
...
2
votes
2answers
563 views
Replace the shortest match of a string pattern
I have this string:
update mytable set mycol=myvalue where mycol=yourvalue;
I need to convert it to:
insert into mytemp select * from mytable where mycol=youvalue;
I can accomplish it like this ...
3
votes
4answers
220 views
Sort input file by the results of a regex
I'd like to sort a file based on the results of a regex expression. For example, if I have the following property declarations in Obj-C
@property (nonatomic, strong) id <AlbumArtDelegate, ...
2
votes
1answer
206 views
How to join vCards lines
vCard uses a special way to split long lines: At 75 characters, insert a DOS newline and a space. Joining therefore means to replace all occurrences of the sequence "CR, LF, space" with an empty ...
2
votes
2answers
504 views
How to do a regex search in a UTF-16LE file while in a UTF-8 locale?
EDIT: Due to a comment Warren Young made, it made me realize that I was not clear on one quite relevant point. My search string is already in UTF-16LE order (not in Unicode Codepoint order, which is ...
2
votes
1answer
173 views
Delete repeated words between brackets inline
Our input looks something like
2012-04-17 [GBPGBP]
2012-04-13 [GBP GBP]
2012-04-13 [GBP]
2012-04-11 [GBPGBP]
2012-04-11 [GBP GBP]
2012-04-10 [GBPGBP]
2012-04-06 [GBP GBP GBP]
2012-04-17 ...
1
vote
1answer
276 views
Multiply certain numbers in a text -file by certain constant
I want an alternative solution to this jQuery hack, tasting a bit reinventing the wheel -- look I am sure I could do this with some one-liner using basic *ix tools. Look much easier and ...
9
votes
6answers
603 views
Text Manipulation Across multiple lines
I Have a file that has text like this:
AAAA
BBBB
CCCC
DDDD
1234
5678
9012
3456
EEEE
7890
etc...
And i want to match up the Alphabetic lines with the Numeric lines so they are like this:
...
3
votes
1answer
128 views
Character classes: construct my own
I want to construct my own character class in a script, then modify (and use) it, for example:
[:myclass:] contains a, *, \n (as linefeed) and [WHITESPACE].
I want to add all characters to ...
6
votes
4answers
12k views
Finding text between two specific characters or strings
Say I have lines like this:
*[234]*
*[23]*
*[1453]*
where * represents any string (except a string of the form [number]). How can I parse these lines with a command line utility and extract the ...
2
votes
2answers
951 views
What is the python equivalent of grep -v?
I like grep -v. I use it all the time. But I am also doing some text processing in python, and there is one crucial thing that I lack.
Usually, I use grep -v to take extraneous stuff out of text.
...
1
vote
3answers
195 views
grep equivalent of the kwrite regex [A-Z][A-Z]+
So, it took me ages, but I finally learned to think in terms of regular expressions, thanks to using them in kwrite.
But I still don't know how to translate that knowledge to grep. I love my grep, ...
8
votes
6answers
734 views
Delete lines beginning with #
How do I delete lines beginning with a #, given that there can be whitespace on the left and right of the #?
# Master socket provides access to userdb information. It's typically
4
votes
2answers
960 views
How to search and replace multiple needles by one word via one expression?
Assume you have a text file:
foo fnord bar
bizz foo poit
And now I would want to replace both "foo" and "bar" into "narf".
I know I could use:
sed -e 's/foo/narf/g' -e 's/bar/narf/g' fileName
...
3
votes
0answers
130 views
How to use regrex with AWK for string replacement in this example? [duplicate]
Possible Duplicate:
How to use regrex with AWK for string replacement in this example?
Suppose there is some text from a file:
(bookmarks
("Chapter 1 Introduction 1" "#1"
("1.1 Problem ...
5
votes
3answers
12k views
How to use regrex with AWK for string replacement in this example?
Suppose there is some text from a file:
(bookmarks
("Chapter 1 Introduction 1" "#1"
("1.1 Problem Statement and Basic Definitions 23" "#2")
("Exercises 31" "#30")
("Notes and References 42" "#34"))
)
...
2
votes
2answers
309 views
parsing through log file and printing out regex backreferences
I want to parse my /var/log/maillog to print out the email addresses in "from=<>" and "to=<>" (mainly to do a quick check for false positives in the DNS RBLs that I've configured)
A maillog ...
12
votes
3answers
4k views
Can grep output only specified groupings that match?
Say I have a file:
# file: 'test.txt'
foobar bash 1
bash
foobar happy
foobar
I only want to know what words appear after "foobar", so I can use this regex:
"foobar \(\w\+\)"
The parenthesis ...
3
votes
2answers
887 views
sed or tr one-liner to delete all numeric digits
So, I have this textfile, and it consists of mostly alphanumeric characters. It's a standard document. But since I copied it and pasted it from a PDF, there are page numbers in there. I don't much ...
12
votes
9answers
1k views
There must be a better way to replace single newlines only?
I am in the habit of writing one line per sentence because I typically compile things to LaTex, or am writing in some other format where line breaks get ignored. I use a blank line to indicate the ...
