I know that BASH =~ regex can be system-specific, based on the libs available -- in this case, this is primarily CentOS 6.x (some OSX Mavericks with Macports, but not needed) Thanks! ‘^’ symbol is used to convert the first character of any string to uppercase and ‘^^’ symbol is used to convert the whole string to the uppercase. Thanks. After deleting the lines matches with the pattern Vim: $ ./fileop.sh -d Vim text It is the most popular editor amongst Linux Journal readers. It enable you to match several values against one variable. Think of it terms of regular expressions: Glob Regular Expression Equivalent Description? I keep finding conflicting information regarding the ability to use regex in a bash case statement. ... How to check if a string begins with some value in bash. Bash Case Example 3. I've been using the following regex below in a bash script on RHEL 5.5 using version GNU bash, version 3.2.25(1)-release I've tried using the script on RHEL 6.3 which uses GNU bash, version 4.1.2(1)-release I assume there's been alot of changes to bash since that's quite a jump in revisions.... (12 Replies) 1)Basic Regular expressions. One can test that a bash variable starts with a string or character in bash efficiently using any one of the following methods. How can I write a case statement using regex as condition (to match numbers)? Solution # 2: Use regex with case patterns. You can convert the case of the string more easily by using the new feature of Bash 4. It is easier to read and write. bash case regex, Is there any way other than putting the two character cases [Ss] for each character because it is not about the initials, but all the characters can come in any case? The egrep command is the same as the grep -E combination, you just don’t have to use the -E option every time. I tried a few different ways I came up with (e.g., [0-9]+ or ^[0-9][0-9]*$ ); none of them works. Last edited by radoulov; 04-28-2014 at 04:10 PM .. The bash man page refers to glob patterns simply as "Pattern Matching". Regular expressions (Regexp) is one of the advanced concept we require to write efficient shell scripts and for effective system administration. Also, refer to our earlier article on Bash ~ expansaion and { } expansion. I looked at previous posts but there are not like my case. Basically regular expressions are divided in to 3 types for better understanding. 2)Interval Regular expressions (Use option -E for grep and -r for sed). Bash case regex output. Case command pattern supports regular expressions, which provide a concise and flexible means for identifying words, or patterns of characters. It is the most popular editor amongst Linux Journal readers. Because this gets tiresome very quickly, the egrep command was created. (patterns) (regex)? 3)Extended Regular expressions (Use option -E for grep and … (Recommended Read: Bash Scripting: Learn to use REGEX (Part 2- Intermediate)) Also Read: Important BASH tips tricks for Beginners For this tutorial, we are going to learn some of regex basics concepts & how we can use them in Bash using ‘grep’, but if you wish to use them on other languages like python or C, you can just use the regex part. The case statement is good alternative to multilevel if-then-else-fi statement. ← Exit command • Home • Dealing with case sensitive pattern →. Introduction – In bash, we can check if a string begins with some value using regex comparison operator =~. To use the extended regular expressions with grep, you have to use the -E (extended) option. This post for example shows how to make regex case insensitive when using list of characters []. In the patterns to a case command. 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