I was trying to use REGEX_EXTRACT_ALL and seems like if the argument
contains semi-colon, the script errors out.

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Data File contents:

cat data;
foo=bar;sessionIdHash=123123123;alice=bob

Script:

a = load 'data1' using PigStorage() as (aa:chararray);

b = foreach a generate REGEX_EXTRACT_ALL(aa,'.*sessionIdHash=(.*);');

dump b;

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Pig confuses semi-colon within the UDF argument. Here is the stack-trace.
Pig Stack Trace
---------------
ERROR 1200: <file test.pig, line 5, column 0>  mismatched character '<EOF>'
expecting '''

org.apache.pig.impl.logicalLayer.FrontendException: ERROR 1000: Error
during parsing. <file test.pig, line 5, column 0>  mismatched character
'<EOF>' expecting '''
    at org.apache.pig.PigServer$Graph.parseQuery(PigServer.java:1610)
    at org.apache.pig.PigServer$Graph.registerQuery(PigServer.java:1549)
    at org.apache.pig.PigServer.registerQuery(PigServer.java:534)
    at
org.apache.pig.tools.grunt.GruntParser.processPig(GruntParser.java:960)
    at
org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptParser.java:412)
    at
org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:190)
    at
org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java:166)
    at org.apache.pig.tools.grunt.Grunt.exec(Grunt.java:84)
    at org.apache.pig.Main.run(Main.java:602)
    at org.apache.pig.Main.main(Main.java:154)
Caused by: Failed to parse: <file test.pig, line 5, column 0>  mismatched
character '<EOF>' expecting '''
    at
org.apache.pig.parser.QueryParserDriver.parse(QueryParserDriver.java:228)
    at
org.apache.pig.parser.QueryParserDriver.parse(QueryParserDriver.java:168)
    at org.apache.pig.PigServer$Graph.parseQuery(PigServer.java:1602)
    ... 9 more
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