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Full Discussion: Trouble with grouping regex
Top Forums UNIX for Dummies Questions & Answers Trouble with grouping regex Post 302494957 by zaxxon on Wednesday 9th of February 2011 01:39:01 AM
Old 02-09-2011
Code:
grep -E "^[A-Z]{3}[[:alnum:][:space:]-]+"

  • Added ^ for the beginning of the line (if appropriate).
  • You said 3 big letters in the beginng - your code has only a {2}.
  • Not sure if there is only single spaces, so using [:space:] to include tabs too.
  • The grouped expressions are all inside [...], not inside (...).
 

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RE_COMP(3)						     Linux Programmer's Manual							RE_COMP(3)

NAME
re_comp, re_exec - BSD regex functions SYNOPSIS
#define _REGEX_RE_COMP #include <sys/types.h> #include <regex.h> char *re_comp(char *regex); int re_exec(char *string); DESCRIPTION
re_comp() is used to compile the null-terminated regular expression pointed to by regex. The compiled pattern occupies a static area, the pattern buffer, which is overwritten by subsequent use of re_comp(). If regex is NULL, no operation is performed and the pattern buffer's contents are not altered. re_exec() is used to assess whether the null-terminated string pointed to by string matches the previously compiled regex. RETURN VALUE
re_comp() returns NULL on successful compilation of regex otherwise it returns a pointer to an appropriate error message. re_exec() returns 1 for a successful match, zero for failure. CONFORMING TO
4.3BSD. NOTES
These functions are obsolete; the functions documented in regcomp(3) should be used instead. SEE ALSO
regcomp(3), regex(7), GNU regex manual COLOPHON
This page is part of release 3.44 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. GNU
1995-07-14 RE_COMP(3)
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