Hi
I have a file with data arranged into columns. The first column is the chromosome name.
When I use grep to subset only rows with chr1, I get chr1 but also chr10, chr11,..
How do I get only rows with chr1?
grep chr1 filein > fileout
head fileout
chr1 59757841
chr11 108258691 ... (2 Replies)
Hi,
I'm struggling with a regex that would match a 'b' that follows an 'a' and is at the end of a string of non-white characters. For example:
Line 1: aba abab b abb aab bab baa
I can find the right strings but I'm lacking knowledge of how to "discard" the bits that precede bs.... (2 Replies)
Hi all,
any idea how to match the following:
char*<no or any string or space> buf and
char *<no or any string or space> buf
i need to capture the buf characters too.
currently i need two checks to cover this:
#search char* <any string> buf or char *<any string> buf
@noarray =... (2 Replies)
Hi all,
I am looking for a regex syntax to match repeated appearance. Likes,
']+]+' matches for string '65A SOME MORE AND 78B'
Now, this gets messy if I need to extract all such repeated appearance. I don't want to write ] four or five times for matching repeated appearance.
Thanks in... (2 Replies)
I am trying to match a similar line using grep with regular expression
the line is
/remote/mac/pbbbb/abc/def/hij/hop/include/abc/tif/element/test/testfiles/Office.cpp:57: const OfficeType& getType().get() const;
I just need to extract the bold characters using grep with regular expression.... (5 Replies)
hi everyone
suppose we have two scenario
echo ABCD | grep \{4\}
DATE
echo SYSDATE | grep \{4\}
SYSDATE
i want to match the string of four length only please help (5 Replies)
I've found this script which seems very promising to solve my issue:
To search and replace many different database passwords in many different (.php, .pl, .cgi, etc.) files across my filesystem.
The passwords may or may not be contained within quotes, single quotes, etc.
#!/bin/bash... (4 Replies)
echo 20110101 | awk '{ print match($0,/^((17||18||19||20)|)-*(|0|1)-*(|0||3)$/))
I am getting a match for the above, where as it shouldn't, as there is no hyphen in the echoed date.
Another question is what is the difference between || and | in the above statement (4 Replies)
Hi
I'd like to add the newline:
\tuser: nobody", or "<TAB>user: nobody
to all files named:
docker-compose.ymlin subfolders of pwd with names beginning with 10-20.
Within these files, I'd like to find the line (there'll only be one) containing:
command: celery workerNOTE: As far as... (2 Replies)
Discussion started by: duncanbetts
2 Replies
LEARN ABOUT BSD
re_exec
REGEX(3) Library Functions Manual REGEX(3)NAME
re_comp, re_exec - regular expression handler
SYNOPSIS
char *re_comp(s)
char *s;
re_exec(s)
char *s;
DESCRIPTION
Re_comp compiles a string into an internal form suitable for pattern matching. Re_exec checks the argument string against the last string
passed to re_comp.
Re_comp returns 0 if the string s was compiled successfully; otherwise a string containing an error message is returned. If re_comp is
passed 0 or a null string, it returns without changing the currently compiled regular expression.
Re_exec returns 1 if the string s matches the last compiled regular expression, 0 if the string s failed to match the last compiled regular
expression, and -1 if the compiled regular expression was invalid (indicating an internal error).
The strings passed to both re_comp and re_exec may have trailing or embedded newline characters; they are terminated by nulls. The regular
expressions recognized are described in the manual entry for ed(1), given the above difference.
SEE ALSO ed(1), ex(1), egrep(1), fgrep(1), grep(1)DIAGNOSTICS
Re_exec returns -1 for an internal error.
Re_comp returns one of the following strings if an error occurs:
No previous regular expression,
Regular expression too long,
unmatched (,
missing ],
too many () pairs,
unmatched ).
3rd Berkeley Distribution May 15, 1985 REGEX(3)