01-06-2017
You do not need to escape it in awk. With awk a single character field separator, that is not a space character, is not treated as a regular expression string, but as a literal character.
Quote:
An extended regular expression can be used to separate fields by assigning a string containing the expression to the built-in variable
FS, either directly or as a consequence of using the
-F sepstring option. The default value of the
FS variable shall be a single <space>. The following describes
FS behavior:
1. If
FS is a null string, the behavior is unspecified.
2. If
FS is a single character:
a. If FS is <space>, skip leading and trailing <blank> and <newline> characters; fields shall be delimited by sets of one or more <blank> or <newline> characters.
b. Otherwise, if FS is any other character c, fields shall be delimited by each single occurrence of c.
3. Otherwise, the string value of
FS shall be considered to be an extended regular expression. Each occurrence of a sequence matching the extended regular expression shall delimit fields.
awk:regular expressions
Last edited by Scrutinizer; 01-06-2017 at 12:21 PM..
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LEARN ABOUT ULTRIX
re_exec
regex(3) Library Functions Manual regex(3)
Name
re_comp, re_exec - regular expression handler
Syntax
char *re_comp(s)
char *s;
re_exec(s)
char *s;
Description
The subroutine compiles a string into an internal form suitable for pattern matching. The subroutine checks the argument string against
the last string passed to
The subroutine returns 0 if the string s was compiled successfully; otherwise a string containing an error message is returned. If is
passed 0 or a null string, it returns without changing the currently compiled regular expression.
The subroutine 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 and may have trailing or embedded newline characters; they are terminated by nulls. The regular expressions
recognized are described in the manual entry for given the above difference.
Diagnostics
The subroutine returns -1 for an internal error.
The subroutine returns one of the following strings if an error occurs:
No previous regular expression
Regular expression too long
unmatched (
missing ]
too many () pairs
unmatched )
See Also
ed(1), ex(1), egrep(1), fgrep(1), grep(1)
regex(3)