what does double star regex means in spring security url -

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i came across spring project saw security configuration following

<intercept-url pattern="/register/**" access="permitall()" />

after google , digging more not able find out double star means /register/** great if explain me. significance of stars in urls spring security.

these patters ant-style path patterns (https://ant.apache.org/manual/dirtasks.html#patterns). ** matches 0 or more 'directories' in path, take @ antpathmatcher


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