Now we will get to the various options you may give your regexp-engine. Please keep in mind that this depends on the engine you are working ...

The look-ahead is used to only match the string if something lies ahead or does not lie ahead of the current match. The trick is that the lo...

Sometimes you do not need exact matches, or you need to decide between several options. You can define two or more options for the regexp-en...

Like you have learned using the plus and star for repeating, it is also possible to specify the repetition of groups or character classes ...

If you need to match strings with lots of special characters you can use quoting within regular expressions. \Q to turn quoting on \E to tur...

The escape character in regexps is the backslash. To match a backslash you just need to escape it as well. Most functionality in regexps sta...

It is possible to anchor your regexp to each end or both ends of the string. To make sure the match starts with the beginning of the string ...