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This is an introduction to regular expressions for those of you that have heard the phrase “just use a regular expression on that string to extract the data…” but doesn’t understand the thing about a “regular expression”. I’ll write RE instead of “regular expression” from now on to save me some typing. The phrase given above hints that one should use a RE on a text string and that it can be used to extract data from such a string. This is what a RE does: it matches something. A RE is a short way of representing a potentially very complex pattern that is to be matched against a string of characters.
By: Lars Marius Garshol Contents Introduction What is this?