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Fortran: fix catastrophic backtracking
\\\\|\\. is like \\. but causes catastrophic backtracking inside (...)* .
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‎CHANGES

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@@ -24,6 +24,8 @@ Version 2.13.0
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* Coq: add some common keywords, improve recognition of ``Set``
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and qualified identifiers (#2158)
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* F*: Allow C-style comments anywhere in a line
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* Fortran: fix catastrophic backtracking with backslashes in strings
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(#2194)
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* Go: add support for generics (#2167)
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* Inform: update for version 6.40 (#2190)
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* Isabelle: recognize cartouches (#2089)

‎pygments/lexers/fortran.py

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@@ -157,8 +157,8 @@ class FortranLexer(RegexLexer):
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],
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'strings': [
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(r'(?s)"(\\\\|\\[0-7]+|\\.|[^"\\])*"', String.Double),
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(r"(?s)'(\\\\|\\[0-7]+|\\.|[^'\\])*'", String.Single),
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(r'(?s)"(\\[0-7]+|\\[^0-7\n]|[^"\\])*"', String.Double),
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(r"(?s)'(\\[0-7]+|\\[^0-7\n]|[^'\\])*'", String.Single),
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],
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'nums': [

‎tests/snippets/fortran/test_string_cataback.txt

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---input---
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! Bad string, there isn't an even number of backslashes.
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! This should not cause catastrophic backtracking.
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'\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\'
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---tokens---
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"! Bad string, there isn't an even number of backslashes.\n" Comment
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'! This should not cause catastrophic backtracking.\n' Comment
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"'" Error
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'\\' Error
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'\\' Error
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'\\' Error
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'\\' Error
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'\\' Error
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"'" Error
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'\n' Text.Whitespace

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