I found this regular expression in some javascript code and not sure exactly what is doing to the string.
name = name.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]"); var regexS = "[\\?&]"+name+"=([^&#]*)"; var regex = new RegExp( regexS ); var state = History.getState(); var current_url = state.cleanUrl; var results = regex.exec( current_url ); This regex is used to see if the parameter contained in name (ie. param or param[]) exists in the url current_url.
Examples, for name the regex is:
name regex ---- ----- param [?&]param=[^&#]* param[] [?&]param\[\]=[^&#]* The regex will search if there is a ? or a # followed by param= followed by any number of character that is not & or # (ie. the value of the param).
First, it replaces [ with \[ and ] with \] in name. Then it puts name in a new regex which searches for \, ? or & followed by the name variable, followed by =, followed by any number of ^, &, or # characters.
In the context of a url, it seems it means to find a particular $_GET variable.
