Make replace, delete and "is" functions for strings
Functions for building string functions for replacement, deletion and testing
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pattern to look for, as defined by a POSIX regular expression. See the "Extended Regular Expressions" section of regex for details. See fixed, ignore.case and perl for how to use other types of matching: fixed, case insensitive and perl-compatible expressions.
string. References of the form
These functions build functions that take a single string argument and return a vector as a result.
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