Sponsored Content
Top Forums Programming Regarding a GREAT site for understanding and Visualizing regex patterns. Post 303038860 by wisecracker on Monday 16th of September 2019 04:08:52 AM
Old 09-16-2019
Someone told me not that long ago that the next big thing in computing are Regular Expressions.
Not needing such things in what I do using computers I thought, "Why, surely it is AI?"
Then I joined here and seeing you guys using them gobsmacked me. I had no idea how important BREs and EREs were until coming on here.

However a tool like that makes them easy to understand.

(Whilst in Perl mode I will learn how to use Perl's REs.)

Thanks Ravinder, great find...
This User Gave Thanks to wisecracker For This Post:
 

6 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Understanding a regex

Hi, Please help me to understand the bold segments in the below regex. Both are of same type whose meaning I am looking for. find . \( -iregex './\{6,10\}./src' \) -type d -maxdepth 2 Output: ./20111210.0/src In continuation to above: sed -e 's|./\(*.\{1,3\}\).*|\1|g' Output: ... (4 Replies)
Discussion started by: vibhor_agarwali
4 Replies

2. Shell Programming and Scripting

Understanding regex behaviour when using quantifiers

# echo "Teest string" | sed 's/e*/=>replaced=</' =>replaced<=Teest string So, in the above code , sed replaces at the start. does that mean sed using the pattern e* settles to zero occurence ? Why sed was not able to replace Teest string. # echo "Teest string" | sed 's/e*//g' Tst string ... (6 Replies)
Discussion started by: chidori
6 Replies

3. Shell Programming and Scripting

Regex patterns

can someone please confirm for me if i'm right: the pattern: ORA-0*(600?|7445|4) can someone give me an idea of all the entries the pattern above will grab from a database log file? is it looking for the following strings?: ORA-0600 ORA-7445 4) (2 Replies)
Discussion started by: SkySmart
2 Replies

4. Shell Programming and Scripting

Need Quick help on Understanding sed Regex

Hi Guys, Could you please kindly explain what exactly the below SED command will do ? I am quite confused and i assumed that, sed 's/*$/ /' 1. It will remove tab and extra spaces .. with single space. The issue is if it is removing tab then it should be Î right .. please assist.... (3 Replies)
Discussion started by: Nandy
3 Replies

5. Shell Programming and Scripting

Need help understanding this Regex.

Hi everyone, This regex looks simple and yet it doesn't make sense how it's manipulating the output. ifconfig -a eth0 Link encap:Ethernet HWaddr 00:0c:49:c2:35:6v inet addr:192.16.1.1 Bcast:192.168.226.255 Mask:255.255.255.0 inet6 addr:... (2 Replies)
Discussion started by: xcod3r
2 Replies

6. What is on Your Mind?

Virtualized Cyberspace - Visualizing Patterns & Anomalies for Cognitive Cyber Situational Awareness

Our team just published this technical report on ResearchGate: Virtualized Cyberspace - Visualizing Patterns & Anomalies for Cognitive Cyber Situational Awareness ABSTRACT ACKNOWLEDGMENTS Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International Public License This... (0 Replies)
Discussion started by: Neo
0 Replies
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 3.25 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)
All times are GMT -4. The time now is 04:03 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy