The E2E Bridge uses the ICU's Regular Expressions package to compute regular expressions.
This appendix is divided into three parts:
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The character \ (backslash) has a special meaning for EAL (E2E Bridge Action Language) strings and regular expressions (RE). In EAL strings, it is used to escape single quotes, double quotes and itself. In REs, it is used to escape special characters and also itself. This double function of backslashes leads to three exceptions from the intuitive usage of backslashes if EAL literals are used to define a RE pattern that contains the same escape sequences as used in EAL literals. The exceptions are: if RE = \ \ then EAL literal = \ \ \ \
if RE = \ " then EAL literal = \ \ \ "
if RE = \ ' then EAL literal = \ \ \ '
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