I solved it by piping two regexp, the second one using the switch -v to invert the results, but I am sure, there is a way, to write this in one regexp. This is, where I failed to combined these two regexp groups. Regular expressions are constructed analogously to arithmetic expressions, by using various operators to combine smaller expressions. grep Examples grep men GrepMe grep fo GrepMe egrep fo+ GrepMe egrep -n Tthe GrepMe fgrep The GrepMe egrep NC+0-9A GrepMe fgrep. 2 like which works fine and matches well.īut the last three expressions should not be counted as bibliography items and therefore my final regular expression should read like "find all Regexp of No. ![]() To match these, I should write regexp No. Unfortunately, there are three identfier, which do not start a bibliography source: and I occasionally use some of them in my files. 1 should contain to match the starting line of an entry. Actually, there are more than 50 different tpye identifier defined, but this might expand in the future? Usually (but not necessarily) this identifiers are placed right at the beginning of the line. To those not familiar with BibTeX: each entry starts with an type identifier such as and so on. So I said to myself: "lets hack a quick script for that!" ![]() ![]() Later on, I will introduce some regex challenges that you'll solve using Python. In this tutorial, we're going to cover regex basics with the help of this site. I was curious, how many BibTeX entries I gathered in the last decades. Some practical examples of using regex are batch file renaming, parsing logs, validating forms, making mass edits in a codebase, and recursive search.
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