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This article shares with you what you need to pay attention to about the beginning of ^ and the end of $in regular expressions. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

A regular expression is a text pattern that includes ordinary characters (for example, letters between an and z) and special characters (called metacharacters). The pattern describes one or more strings to match when searching for text.

Note about the start of ^ and the end of $

\ b match a word boundary

?:

? =

?!

These four don't add ^ and $, the others add ^ and $.

About the understanding of |

1 / ^ a | zood$/

When the front is a, whatever it is works well.

When the back is zood, no matter what it is, it works.

2 / ^ (a | z) ood$/

As a result,

Aood

Zood

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