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Top Forums Shell Programming and Scripting Replace my perl with awk or sed Post 303000572 by Scrutinizer on Friday 14th of July 2017 01:14:20 PM
Old 07-14-2017
If you have grep -o,

for the email addresses (even though a lot more characters are allowed, but this is what the perl says):
Code:
grep -Eo '[[:alnum:]_.-]+@[[:alnum:]_.-]+[[:alnum:]]+'

Filenames such as foo.exe or bar.bin:
Code:
grep -Eo '[[:alnum:]_.-]+\.(bin|exe)'


Last edited by Scrutinizer; 07-14-2017 at 03:06 PM.. Reason: Added underscores which are also word characters..
This User Gave Thanks to Scrutinizer For This Post:
 

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

NAME
iswalnum - test for alphanumeric wide character SYNOPSIS
#include <wctype.h> int iswalnum(wint_t wc); DESCRIPTION
The iswalnum() function is the wide-character equivalent of the isalnum(3) function. It tests whether wc is a wide character belonging to the wide-character class "alnum". The wide-character class "alnum" is a subclass of the wide-character class "graph", and therefore also a subclass of the wide-character class "print". Being a subclass of the wide-character class "print", the wide-character class "alnum" is disjoint from the wide-character class "cntrl". Being a subclass of the wide-character class "graph", the wide-character class "alnum" is disjoint from the wide-character class "space" and its subclass "blank". The wide-character class "alnum" is disjoint from the wide-character class "punct". The wide-character class "alnum" is the union of the wide-character classes "alpha" and "digit". As such, it also contains the wide-char- acter class "xdigit". The wide-character class "alnum" always contains at least the letters 'A' to 'Z', 'a' to 'z' and the digits '0' to '9'. RETURN VALUE
The iswalnum() function returns nonzero if wc is a wide character belonging to the wide-character class "alnum". Otherwise it returns zero. CONFORMING TO
C99. NOTES
The behavior of iswalnum() depends on the LC_CTYPE category of the current locale. SEE ALSO
isalnum(3), iswctype(3) COLOPHON
This page is part of release 3.27 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
1999-07-25 ISWALNUM(3)
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