Bash case does not use regular expressions, but shell pattern matching only. Therefore, instead of regex ws- [0-9]+\.host\.com you should use pattern ws*.host.com (or ws-+ ([0-9]).host.com, but that looks a bit advanced and I've never tried that :-)
A regular expression is a pattern that provides a flexible and concise mean to match the string of text. A regular expression is also referred to as regex or regexp.. A regular expression can be either simple or complex, depending on the pattern you want to match.
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)
A regular expression is not language specific but they differ slightly for each language. Regular Expression in Java is most similar to Perl. Java Regex classes are present in java.util.regex package that contains three classes: Pattern: Pattern object is the compiled version of the regular
1. Match any character using regex '.' character will match any character without regard to what character it is. The matched character can be an alphabet, number of any special character. By default, period/dot character only matches a single character. To create more meaningful patterns, we can combine it with other regular expression constructs.
Regex lets you specify substrings with a certain range of characters, such as A-Za-z0-9. Part A This is the input string we are matching. Notice how it contains 3 uppercase words, with no spacing in between. Part B We see the verbatim string literal syntax.
May 27, 2010 · If \K appears in a regex, it causes the regex matcher to drop everything before that point from the internal record of "Which string did this regex match?". This is most useful in conjunction with s/// , where it gives you a simple way to match a long expression, but only replace a suffix of it.
The function toupper converts character case to upper case for the passed string. User Defined Functions. You can define your function and use them like this