I have to match patterns from a main string using regex in java 8

This is the pattern I have so far.

Email.*?(:parameter[0-9] [^,])

It works on line 1 and line 2 below but fails on line 3 by matching just this Email IN (:parameter10

Note: I am fine with the closing bracket at the end being matched or not, I can work either way

// should match "Email = :parameter1)"
String line1 = "(Email = :parameter1)"; 

// should match "Email IN (:parameter1,:parameter2)"
String line2 = "(Email IN (:parameter1,:parameter2) AND (FirstName = :parameter3))"; 


// should match "Email IN (:parameter10,:parameter11)"
String line3 = "(Email IN (:parameter10,:parameter11) AND (FirstName = :parameter13))";

Thanks in advance

CodePudding user response：

You can use

Email.*?(:parameter[0-9] )(?![0-9,])\)?

See the regex demo. Details:

• Email - a fixed string
• .*? - any zero or more chars other than line break chars as few as possible
• (:parameter[0-9] ) - Group 1: a : char, then parameter word and then one or more digits
• (?![0-9,]) - a negative lookahead that fails the match if there is a digit or a comma immediately to the right of the current location
• \)? - an optional ) char.

CodePudding user response：

Based on your input, technically this is sufficient:

Email[^)]*\)

It takes everything for Email up to the last ) inclusive.

If you want more validation on the parameterX then this is more specific

Email.*?((:parameter\d ,?) )\)

It takes Email then anything until first parameter then optional other parameter and again ends by the )