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[edit] Regular Expressions

2> regexp:match("hello world","w.+d").
{match,7,5}

The regular expression, "w.+d" matches the string, "hello world" at location 7 for 5 chars.

9> regexp:sub("10203040","([2-4]0)+","01").
{ok,"1001",1}

Makes a substitution, replacing "203040" with "01".