java - Excluding markup on lowercased parentheses letters -


a string can contain 1 many parentheses in lower case letters string content = "this (a) nightmare"; want transform string "<centamp>this </centamp>(a) <centamp>nightmare</centamp>"; add centamp markup around string if has lowercase letter in parentheses should excluded markup.

this have tried far, doesn't achieve desired result. there none many parentheses in string , excluding markup should happen every parentheses. 

pattern pattern = pattern.compile("^(.*)?(\\([a-z]*\\))?(.*)?$", pattern.multiline);     string content = "this (a) nightmare"; system.out.println(content.matches("^(.*)?(\\([a-z]*\\))?(.*)?$")); system.out.println(pattern.matcher(content).replaceall("&lt;centamp&gt;$1$3&lt;/centamp&gt;$2"));

this can done in 1 replaceall:

string outputstring =     inputstring.replaceall("(?s)\\g((?:\\([a-z]+\\))*+)((?:(?!\\([a-z]+\\)).)+)",                            "$1<centamp>$2</centamp>");

it allows non-empty sequence of lower case english alphabet character inside bracket \\([a-z]+\\).

features:

  • whitespace sequences tagged.
  • there no tag surrounding empty string.

explanation:

  • \g asserts match boundary, i.e. next match can start end of last match. can match beginning of string (when have yet find match).

  • each match of regex contain sequence of: 0 or more consecutive \\([a-z]+\\) (no space between allowed), , followed @ least 1 character not form \\([a-z]+\\) sequence.

    • 0 or more consecutive \\([a-z]+\\) cover case string not start \\([a-z]+\\), , case string not contain \\([a-z]+\\).

      in pattern portion (?:\\([a-z]+\\))*+ - note + after * makes quantifier possessive, in other words, disallows backtracking. put, optimization.

    • one character restriction necessary prevent adding tag encloses empty string.

      in pattern portion (?:(?!\\([a-z]+\\)).)+ - note every character, check whether part of pattern \\([a-z]+\\) before matching (?!\\([a-z]+\\))..

  • (?s) flag cause . match character including new line. allow tag enclose text spans multiple lines.


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