Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

how to test the regular expressions

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting how to test the regular expressions
# 1  
Old 06-05-2008
MySQL how to test the regular expressions
Hi,

lam taking the IP address as input from the user. I want to test whether the user has entered the IP address in the right format or not.

Can any one suggest me the syntax to test the user given IP address ASAP. Its a bit urgent.


Regards,
Smilie
# 2  
Old 06-05-2008
this could help you:
https://www.unix.com/shell-programmin...p-address.html
# 3  
Old 06-05-2008
Code:
o1='1[0-9]{0,2}|2([6-9]|[0-4][0-9]?|5[0-4]?)?|[3-9][0-9]?'
o0='0|255|'"$o1"
if echo "$ip" | egrep -v "^($o1)(\.($o0)){2}\.($o1)$" >/dev/null; then
  echo invalid ip
fi

Login or Register to Ask a Question

Previous Thread | Next Thread

9 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Regular expressions help

need a regex that matches when a number has a zero (0) at the end of it so like 10 20 120 30 330 1000 and so on (6 Replies)
Discussion started by: linuxkid
6 Replies

2. Shell Programming and Scripting

Test Regular Expressions on Arrays in Awk

How would I test for a suffix on an element in an array? e.g. testing for /$html/ of an element array (4 Replies)
Discussion started by: ROFL
4 Replies

3. Shell Programming and Scripting

Regular Expressions

what elements does " /^/ " match? I did the test which indicates that it matches single lowercase character like 'a','b' etc. and '1','2' etc. But I really confused with that. Because, "/^abc/" matches strings like "abcedf" or "abcddddee". So, what does caret ^ really mean? Any response... (2 Replies)
Discussion started by: DavidHe
2 Replies

4. Shell Programming and Scripting

Regular Expressions

#!/usr/bin/perl $word = "one last challenge"; if ( $word =~ /^(\w+).*\s(\w+)$/ ) { print "$1"; print "\n"; print "$2"; } The output shows that "$1" is with result one and "$2" is with result challenge. I am confused about how this pattern match expression works step by step. I... (8 Replies)
Discussion started by: DavidHe
8 Replies

5. UNIX for Advanced & Expert Users

Regular Expressions

Hi, below is a piece of code written by my predecessor at work. I'm kind of a newbie and am trying to figure out all the regular expressions in this piece of code. It is really a tough time for me to figure out all the regular expressions. Please shed some light on the regular expressions... (3 Replies)
Discussion started by: ramky79
3 Replies

6. UNIX for Dummies Questions & Answers

regular expressions

how to find for a file whose name has all characters in uppercase after 'project'? I tried this: find . -name 'project**.pdf' ./projectABC.pdf ./projectABC123.pdf I want only ./projectABC.pdf What is the regular expression that correponds to "all characters are capital"? thanks (8 Replies)
Discussion started by: melanie_pfefer
8 Replies

7. Shell Programming and Scripting

regular expressions

Hi, can anyone advise me how to shorten this: if || ; then I tried but it dosent seem to work, whats the correct way. Cheers (4 Replies)
Discussion started by: jack1981
4 Replies

8. Shell Programming and Scripting

Regular Expressions

How can i create a regular expression which can detect a new line charcter followed by a special character say * and replace these both by a string of zero length? Eg: Input File san.txt hello hi ... (6 Replies)
Discussion started by: sandeep_hi
6 Replies

9. Programming

regular expressions in c++

How do I use the regular expressions in c++? (2 Replies)
Discussion started by: szzz
2 Replies
Login or Register to Ask a Question