Cache currency symbol regex to improve parse performance

[pranavbabu]

Cached the currency symbol regex in Parser to avoid recompiling it on every parse call, improving performance during repeated monetary parsing operations.

Benchmarking currency_symbol_regex creation...
                                user     system      total        real
Dynamic regex generation:   0.551297   0.001920   0.553217 (  0.553221)
Cached regex reuse:         0.003189   0.000083   0.003272 (  0.003271)

[yukideluxe]

Could we just remove the method and just use the constant here?

monetize/lib/monetize/parser.rb

Line 103 in 945da74

match = input.match(currency_symbol_regex)

😊

[yukideluxe]

also, I think the test failure is related 🙏🏻

[yukideluxe]

thanks!