正则表达式 - 谷歌应用程序脚本

Question

I'm trying to extract a substring of a email document with a regular expression. I'm testing the regex online, and it works perfectly:

online regex tester

I have a function to check the regex on Google Apps Script and the same regex isn't working here.

var regex = new RegExp("Intrusion signature\(s\)\:\n\n(.*)");
var e = regex.exec(data);

Google Apps Script code

Logger

Does anyone knows why is not working?

Answer 1

Using a literal regex instead of converting the string to a regex works.

var regex = new RegExp(/Intrusion signature\(s\)\:\n\n(.*)/);

Answer 2

When you use regular strings with RegExp you need to escape every backslash. Here are some alternatives you can use. Another aspect to consider is that if you have CR+LF in your Spreasheet. In that case you need to change your code to include \\r I've added some google API mocked code so that the code snippet can run here

 // ----------------- Ignore this (Mock) Logger=console; class _SpreadsheetApp { getActiveSpreadsheet() { class SpreadSheet { getSheetByName(name) { class Sheet { getRange() { class Range { getValue() { return " * Intrusion signature(s):\\r\\n\\r\\n - This is the text I want to extract.\\r\\n\\r\\n * SI communication:\\r\\n"; } } return new Range(); } } return new Sheet(); } } return new SpreadSheet(); } } var SpreadsheetApp=new _SpreadsheetApp(); // ----------------- Ignore this (Mock) function checkRegExp() { var data=SpreadsheetApp.getActiveSpreadsheet().getSheetByName("LOG").getRange("C213").getValue(); var regex = new RegExp("Intrusion signature\\(s\\)\\:\\n\\n(.*)"); // ORIGINAL var e = regex.exec(data); Logger.log("Original:"+e); var sol1 = new RegExp("Intrusion signature\\\\(s\\\\)\\\\:\\\\r\\\\n\\\\r\\\\n(.*)"); e = sol1.exec(data); if (e) Logger.log("Solution 1:"+e[1]); var sol2 = new RegExp("Intrusion signature\\\\(s\\\\)\\\\:\\\\W{2,4}(.*)"); e = sol2.exec(data); if (e) Logger.log("Solution 2:"+e[1]); var sol3 = new RegExp("Intrusion signature\\\\(s\\\\)\\\\:(?:\\\\x0d\\\\x0a)+(.*)"); e = sol3.exec(data); if (e) Logger.log("Solution 3:"+e[1]); var sol4 = new RegExp(/Intrusion signature\\(s\\)\\:\\r\\n\\r\\n(.*)/); e = sol4.exec(data); if (e) Logger.log("Solution 4:"+e[1]); } checkRegExp()