Its been a while since I’ve ventured into regular expressions, and I always seem to find it a nightmare when I come back to it.  But I’ve found a great tutorial which gives a really good overview of each of the magic commands  / syntax that you can use when performing the matching:

http://gnosis.cx/publish/programming/regular_expressions.html

epfw testcase=validation/invalid-chars/epval-invalid-chars-bind36.xml trace_leve
l=3
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