I created a dozen of custom parsers using Warnings plugin. After that Jenkins Web interface got extremely slow. It takes about 30 sec just to open my project from the Dashboard. "Configure project" takes about a minute to load.
My regular expressions are for IBM XLC compiler and regular expressions are like that - "^\s*"?([^"])"?, line (\d).: (.) ((.)) (.*)$"

The Groovy scripts are like:
— groovy start —
import hudson.plugins.warnings.parser.Warning
import hudson.plugins.analysis.util.model.Priority

Priority priority = Priority.NORMAL
String fileName = matcher.group(1)
String lineNumber = matcher.group(2)
String category = matcher.group(3)
String severity = matcher.group(4)
if (severity == "U" || severity == "S" || severity == "E")
priority = Priority.HIGH
else if (severity == "W")
priority = Priority.NORMAL
else if (severity == "I")
priority = Priority.LOW

String message = matcher.group(5)

category = category + " " + message
.replaceAll("extern \"C\"", "extern C")
.replaceAll("[\"'][^\"]*[\"']", "X")
.replaceAll("
d+ ", " N ")
.replaceAll(" \\d+
.", " N.")

final int MAX_LEN = 128
if (category.length() > MAX_LEN)
category = category.substring(0, MAX_LEN-1)

return new Warning(fileName, Integer.parseInt(lineNumber), "XLC Compiler", category, message, priority);
— groovy end —