PatternSyntaxException in MIF filter

Created by: Alex Falappa

While converting a MIF file I got the following exception:

java.util.regex.PatternSyntaxException: Illegal repetition near index 529
(^[A-Z]{1}:)|(•)|(\\t)|(<[naArR ]{1}[+]*\>)|(<[naArR]{1}=[0-9]+\>)|(<\$.*?>)|(<Default ¶ Font\>)|(<(zenkaku|kanji|full-width|chinese|Indic|Farsi|Hebrew|Abjad|Alif Ba Ta|Thai) [naA]{1}[+]*\>)|(<(zenkaku|kanji|full-width|chinese|Indic|Farsi|Hebrew|Abjad|Alif Ba Ta|Thai) [naA]{1}=[0-9]+\>)|(<(kanji kazu|daiji|hira iroha|kata iroha|hira gojuon|kata gojuon)[+]*\>)|(<(kanji kazu|daiji|hira iroha|kata iroha|hira gojuon|kata gojuon)=[0-9]+\>)|(<Superscript\>)|(<Fixed_Font\>)|(<Regular\>)|(<link\>)|(<Italic\>)|(<Bold\>)|(<Menue\>)|(<{Wingdings_3}\>)|(<{Symbol}\>)
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 ^
        at java.util.regex.Pattern.error(Pattern.java:1969)
        at java.util.regex.Pattern.closure(Pattern.java:3171)
        at java.util.regex.Pattern.sequence(Pattern.java:2148)
        at java.util.regex.Pattern.expr(Pattern.java:2010)
        at java.util.regex.Pattern.group0(Pattern.java:2919)
        at java.util.regex.Pattern.sequence(Pattern.java:2065)
        at java.util.regex.Pattern.expr(Pattern.java:2010)
        at java.util.regex.Pattern.compile(Pattern.java:1702)
        at java.util.regex.Pattern.<init>(Pattern.java:1352)
        at java.util.regex.Pattern.compile(Pattern.java:1054)
        at net.sf.okapi.common.filters.InlineCodeFinder.compile(InlineCodeFinder.java:146)
        at net.sf.okapi.filters.mif.MIFFilter.open(MIFFilter.java:256)
        at net.sf.okapi.filters.mif.MIFFilter.open(MIFFilter.java:197)
        at net.sf.okapi.steps.common.RawDocumentToFilterEventsStep.handleEvent(RawDocumentToFilterEventsStep.java:132)
        at net.sf.okapi.common.pipeline.Pipeline.execute(Pipeline.java:117)
        at net.sf.okapi.common.pipeline.Pipeline.process(Pipeline.java:227)
        at net.sf.okapi.common.pipeline.Pipeline.process(Pipeline.java:199)
        at net.sf.okapi.common.pipelinedriver.PipelineDriver.processBatch(PipelineDriver.java:182)

I cannot disclose the file unfortunately, but the stacktrace appears to point to the offending code.