valRegex improperly referenced

[derek-rmd]

https://github.com/Turistforeningen/node-mongo-querystring/blob/9e3554c2b1ea09a0845ae0526647ca5da21d33d4/index.js#L184

• should be this.valRegex not this.valReqex
• but then this will replace all valid characters with '', instead of invalid chars
• and is also overwritten for ^ and $ a few lines below
  • this should be ret.value = `^${ret.value}`; instead
• an option like escapeRegex: true might be more appropriate here
  • or escapeRegexChars: /[\\^$.*+?()[\]{}|]/g, where use s.replace(this.escapeRegexChars, '\\$&') to escape (source: lodash _.escapeRegex)