regex

This post is part of a series on the difference between pattern matching notation and extended regular expressions. After exploring the differences between pattern matching notation used in pathname and parameter expansion and regular expressions theoretically as well as practically, this table serves as an overview of the basic practical differences when it comes to…

This post is part of a series on the difference between pattern matching notation and extended regular expressions. In the previous post we talked about the differences between pattern matching and regular expressions in a POSIX compatible system. In this post we will do some practical testing of the previous post to help our understanding.…

This post is part of a series on the difference between pattern matching notation and extended regular expressions. It is the standard (according to POSIX) that the shell have some interesting pattern matching abilities in its parameter and pathname expansions (called Pattern Matching Notation). However, they do not use the standards for regular expression (also…

Regular expressions are important tools for programmers, however they are not the same as the pattern matching notation used by POSIX compliant shells. When using shells such as bash (which seems to be POSIX compliant at least with regex and pattern matching notation) it is important not to fall into the trap of thinking that…