All the positions in the string are within that space. Imagine that a string is a space between two walls-one to the left and one to the right. But if you were in a mood to play with logic, you could say: Typically, you would translate ^ as something like "assert that the current position is the beginning of the string". In contrast, boundaries make assertions about what can be matched to the left and right of the current position. Therefore, none of them consume characters.Īnchors assert that the current position in the string matches a certain position: the beginning, the end, or in the case of \G the position immediately following the last match.
These tokens have one thing in common: they are assertions about the engine's current position in the string. Why are ^ and $ called anchors while \b is called a boundary? ✽ Double Negative Delimiter: Character, or Beginning of String ✽ DIY Boundary: between a letter and a digit ✽ DIY Boundary Workshop: "real word boundary" Although this page starts with the regex word boundary \b, it aims to go far beyond: it will also introduce less-known boundaries, as well as explain how to make your own- DIY Boundaries.įor easy navigation, here are some jumping points to various sections of the page:
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