Protect underscores in latex equation when bib data is written to a file

[Xiaowei Wang]

There is a latex equation “${\mathrm{N}}_{2}$“ in the title of my bib data. A backslash is added before the underscore when the bid data is written to a bib file. The following code：

from pybtex.database import BibliographyData,Entry,Person

fields = {}
fields['title'] = 'Test formula of ${\mathrm{N}}_{2}$'
ety = Entry('article',fields=fields)
bibdata = BibliographyData(entries={'test':ety})
bibdata.to_file('minisample.bib',bib_format='bibtex')

outputs:

@article{test,
    title = "Test formula of ${\mathrm{N}}\_{2}$"
}

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Is there a way to avoid the backslash insertion?

[Sebastian Schöps]

I just came across the same problem. The latex encoding is applied to all fields, e.g. DOIs, URLs and crossrefs are messed up by this.

[Xiaowei Wang]

It seems the backslash insertion is unavoidable. So I have to change it back manually.

bibstr = bibdata.to_string(bib_format='bibtex',encoding=encoding)
# undo the bashslash insertion
#\#$\%^\&*()\_
bibstr = bibstr.replace('\#','#')
bibstr = bibstr.replace('\%','%')
bibstr = bibstr.replace('\&','&')
bibstr = bibstr.replace('\_','_')

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