bibtex-field-strings-alistbibtex-field-strings-alist is a variable defined in `
bibtex.el'. Its value is
nilDocumentation: Alist of regexps that M-x bibtex-clean-entry replaces by string constants. Each element has the form (FIELDS REGEXP TO-STR), where FIELDS is a list of BibTeX field names. In FIELDS search for REGEXP, which are replaced by the BibTeX string constant TO-STR. Space characters in REGEXP will be replaced by "[ \t\n]+". You can customize this variable.