Have a look at the discussion following BrowserUK's advice to me at Re: Combining regexes. The gist is that for single-character substitutions, tr is faster than a regex.

Regards,

John Davies

In reply to Re: Need to speed up many regex substitutions and somehow make them a here-doc list by davies
in thread Need to speed up many regex substitutions and somehow make them a here-doc list by xnous

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