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→Using Regular Expressions
* Linux
** GNU grep
** The bash test command <code><nowiki>[[ "string" =~ regexp ]]</nowiki></code>
** The less command, using the / and ? keystrokes for searching forward and backward
** The vi/vim editor
** The bash test command <code><nowiki>[[ "string" =~ regexp ]]</nowiki></code>sed and awk utilities
* Windows
