Flutter dart regular regexp special characters $, () (IV)

Tank you so match ( thank you )

DartPad Online tools

$ Match from the end of the string

From a string abcABC123 Start looking at the end Whether there is ABC Any character in the string
The search results returned true So it does exist

From a string ddaf123\n Find out if it exists \n

From a string ddaf123\r Find out if it exists \r

From a string ddaf123$ Find out if it exists $

() Match the contents in brackets

Match double quotes with no content

Match empty string

Match the entire content in parentheses 123

[123] Yes match to content 123 Inside to any character And (123) The whole content in the matching brackets is different

Match content 123 | 456 | abc

Whether the contents of the string contain double brackets () Any single parenthesis inside Left parenthesis ’(’ or Right bracket ’)’
The single bracket inside the matching double bracket must be added with the transition symbol ‘’

summary

$ Start at the end of the string to find out if there is and [ … ] The contents of any string matching inside
() Whether there is a string matching the whole content in the brackets in the string , for example : (123) (456) (abc)
(…|…|…|…) Whether there are multiple contents in the matching brackets in the string , for example : (123 | 456 | abc)