rewrap

a regexp wrapper, less pain and more fun with regexp :)

feature

• compose the regexp by string, regexp, rewrap object
• compositional method
• refer to the predefined regexp
• get match by named path

document

install

npm install rewrap

dist/rewrap.js and dist/rewrap.min.js can be used in the browser

example

 
    const rewrap = require('rewrap');
 
    const {re, wrap} = rewrap; // wrap is the same as rewrap;
 
    // This npm package contains some frequently used regexp.
    // It can be used as the registry for rewrap.
    const reBuiltins = require('regexp-frequent');
    rewrap.registry(reBuiltins);
 
    re(/^/)    // /^/
    
      .ref('digits')    // /^[0-9]+/
      
      .and(/abc/)    /^[0-9]+abc/
      
      .or(/bc/, /cd/)   // /^[0-9]+abc|bc|cd/
      
      // because the line below is leaded by re, 
      // so @digits will not refer to registry, 
      // and will generate regexp as is.
      .and(/@digits/)   // /^[0-9]+abc|bc|cd@digits/
            
      .wrap   // now switch to rewrap style
      
      // @digits will refer to registry, will be replaced by [0-9]+
      // necessary () is added automatically for or expression
      .and(/@digits/)   // /(?:^[0-9]+abc|bc|cd)@digits[0-9]+/
      
      // &a indicate that a will become (a) 
      // and will be saved as result.$$rewrapData.a while matching
      .and(/a&a/)   // /^[0-9]+abc|bc|cd@digits[0-9]+(a)/
       
      .and(
      
         // generate (xy)
         // will be saved as result.$$rewrapData.xy while matching
         // same as wrap(/(xy)&xy/)
         wrap('x').and('y').save('xy')    // /(xy)/
        
      ) //   /(?:^[0-9]+abc|bc|cd)@digits[0-9]+(a)(xy)/
 
      // the whole above will be saved as result.$$rewrapData. part1 while matching
      .save('part1')
 
      // add current rewrap to registry as sample
      .register('sample')
 
      // refer to sample
      .rewrap(/@sample/)    // /((?:^[0-9]+abc|bc|cd)@digits[0-9]+(a)(xy))((?:^[0-9]+abc|bc|cd)@digits[0-9]+(a)(xy))/
 

compositional method

• rewrap, regexp, or, and, paren, not, lookAhead, optional, any, some, repeat, times, timesMore, headTail, head, tail

they have no side effects, i.e. they always generate a new Rewrap object.

• not, lookAhead, optional, any, some, repeat, times, timesMore

These methods can with/without an item argument, If without an item argument, it will operate on itself(this) and return a new Rewrap object.

register, ref, @path%

someRewrap.register(registry)
someRewrap.register(refPath, value)
someRewrap.register(refPath): value is someRewrap itself
someRewrap.register({refPath:value, ...}): register multiple refPath:value pairs

someRewrap.ref(refPath): use the predefined rewrap in the registry(someRewrap._registry)
someRewrap.and(/@refPath%/): use the predefined rewrap in the registry(someRewrap._registry)

refPath is like x, y, a.b.c, _a, a0.b1._c % can be omit if the following char is not identifier chars [_A-Za-z0-9]
NB. $ is not allowed in the refPath or dataPath(see below).

save, &dataPath%

someRewrap.save(dataPath): same as /@someRewrap&dataPath%/
dataPath is like x, y, a.b.c, _a, a0.b1._c
% can be omit if the following char is not identifier chars [_A-Za-z0-9]
If necessary, () will be added around someRewrap to generate a sub match.

options method

flags, registry

switch source style

someRewrap.re: lead the regexp style chain. In regexp style, @refPath%

someRewrap.wrap: lead the rewrap style chain

show me the code

Please dive into the code for more information. The code is simple and intuitive.

two npm packages work with rewrap

regexp-frequent

The npm package regexp-frequent contains some frequently used regexp. It can be used as the registry for rewrap.

rewrap-patch

The npm package rewrap-patch does monkey patch on String.prototype, make the methods(match, search, split, replace) works better with rewrap. Most of time you do NOT need rewrap-patch, except that you need the match method support someString.match(aRewrap, data).

similar npm packages

These two npm packages have similar part fearture with rewrap: save sub match with name. But rewrap is more convenient and powerful than them(no parens is necessary for name, and dot separated path is supported):
named-regexp: https://www.npmjs.com/package/named-regexp
named-js-regexp: https://www.npmjs.com/package/named-js-regexp

LICENSE

MIT, see LICENSE