Given a vector of strings such as "0.65 (0.6, 0.70)", for example obtained by running optical character recognition (OCR)
software on a screenshot of a published forest plot, parses the strings into a dataframe of
point estimates and upper confidence interval limits. Assumes that the point estimate occurs before
an opening bracket of the form "(" or "[" and that the confidence interval upper limit follows a
sep (by default a comma, but might be a hyphen, for example). To further parse this dataframe
into point estimates and variances, see
parse_CI_string(string, sep = ",")
A vector of strings to be parsed.
The character (not including whitespaces) separating the lower from the upper limits.
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