Comment on \d less efficient than [0-9]parentComments−bodyfour13yIf you're using pcre directly from C code, this is controlled by specifying the PCRE_UCP flag to pcre_compile(). By default, \d and friends only match ASCII characters even if the PCRE_UTF8 flag is set.
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If you're using pcre directly from C code, this is controlled by specifying the PCRE_UCP flag to pcre_compile(). By default, \d and friends only match ASCII characters even if the PCRE_UTF8 flag is set.