Use the following classes to process strings:
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CL_ABAP_[STRING|CHAR]_UTILITIESProvides auxiliary functions for string/character processing
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CL_ABAP_CONV_CODEPAGEFor code page conversion of strings/characters
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CL_ABAP_[REGEX|MATCHER]For regular expression processing
For more information about regular expressions, see the ABAP Keyword Documentation.
For more information about these classes, see their ABAP Doc comments in ABAP Development Tools (ADT).