Escape reserved characters without escaping logic operators #134
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When using multiple filters, they are separated by logical operators AND, OR (; and , respectively in GA query syntax). To avoid screening them with str_replace we can first check valid operators and add 'ga:' prefix where missing and then screen only those reserved characters which are not followed by 'ga:' prefix. See: https://developers.google.com/analytics/devguides/reporting/core/v3/reference#combiningFilters
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When using multiple filters, they are separated by logical operators AND, OR (; and , respectively in GA query syntax). To avoid screening them with str_replace we can first check valid operators and add 'ga:' prefix where missing and then screen only those reserved characters which are not followed by 'ga:' prefix.
See: https://developers.google.com/analytics/devguides/reporting/core/v3/reference#combiningFilters