MAINT: crackfortran regex simplify #18356
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* remove extraneous character class markers used in `crackline_re_1`: `\w` and `=` on their own have no benefit to character class `[]` inclusion * `name_match` has a character class that can be simplified because `\w` metacharacter already encompasses the digit metacharacter and the underscore
* `name_match` regular expression now starts by matching a letter only, based on reviewer feedback
This was referenced Mar 8, 2021
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Backport of #18072.
remove extraneous character class markers used in
crackline_re_1:\wand=on their own have nobenefit to character class
[]inclusionname_matchhas a character class that can besimplified because
\wmetacharacter alreadyencompasses the digit metacharacter and the
underscore