Javascript strReplace

Javascript string replace library by Scott Sloane.

What is it

strReplace is a library built for NodeJS that helps manage replacing parts of any string.

Why use it

String replacement in Javascript is not very straight forward. There are various approaches to it. Such as Regex.Replace() or String.Replace(), but these come with their own issues.

Regex.Replace() Regex can suffer from performance issues, plus is one extra syntax to maintain in your code if you are not already using it.

String.Replace() String.Replace does not have the best performance. Also, it must use regex/g to remove all occurrences within a single string.

The most common solution is to chain String.Split() with String.Join(). Internally this is the method used by strReplace.

String.Split().Join() Has decent performance but when doing many replaces becomes very cumbersome to maintain. i.e.: mystring.split('.').join('_').spit('0').join('O').split('A').join('AA'); //does just three replacements

How to use strReplace

Install

Use NPM to Install

npm i @scottsloane/strreplace

Include strReplace

Add at the top of your Javascript source:

const strReplace = require('@scottsloane/strreplace');

(optional) Set Default replacements

Somewhere in your code before executing a default replacement add:

// Directly set defaults
strReplace.set([
	['.', '▄', true, true],
	['NOT ', '!', false, false]
]);

or:

// Set defaults one at a time
strReplace.add('O', '0', false, false);
strReplace.add(' 0R ', '~', false, false);
strReplace.add(' 0R', '', false, true);
strReplace.add('0R ', '', false, false);

Do a replacement

let t_str = "OR 12~34.5678 NOT O.1.2.3.4 OR 4.3.2.1.0 OR";
let r_str = strReplace.do(t_str);

API Reference

strReplace.set(replacements)

Arguments

replacements Array: List of default replacements to set

Returns

none

Function

strReplace.set(replacements) allows for setting the entire set of default replacements at once. The replacement array must be formated as:

idx | typeof | description ----|--------|------------ 0 | string | search 1 | string | replacement 2 | bool | Use Regex Escape on undo 3 | bool | Use in undo (reverse)

strReplace.get()

Arguments

none

Returns

Array: Current default replacements

Function

Gets the list of current default replacements

strReplace.add(search, replacement, regex, reverse)

Arguments

search String: The search string to replace

replacement String: The string to replace occurrences of search with

regex Boolean: Escapes Regex character '[]' when true

reverse Boolean: Includes the reverse replacement on undo

Returns

none

Function

Adds a replacement item to the default replacement list

strReplace.del

Arguments

search String: The search string to replace

replacement String: The string to replace occurrences of search with

regex Boolean: Escapes Regex character '[]' when true

reverse Boolean: Includes the reverse replacement on undo

Returns

none

Function

Removes the specified replacement item from the default replacement list if it exists

strReplace.do(str, [replacements])

Arguments

str String: The string to apply replacements to.

(optional) replacements Array: a list of replacement items to use instead of the default replacement list

Returns

String: The string with applied replacements

Function

Takes a string and makes the replacements.

strReplace.undo(str, regex, [replacements])

Arguments

str String: The string to undo replacements from

regex Boolean: Applies Regex Escape rules when true

(optional) replacements Array: a list of replacement items to use instead of the default replacement list

Returns

String: The string with applied reverse replacements

Function

Takes a string and reverses the replacements.

strReplace.invalid

Function

Helper Object to identify and remove invalid characters or substrings within a string

strReplace.invalid.set(invalids)

Arguments

invalids Array: A list of characters or strings that are invalid

Returns

none

Function

Sets the list of default invalid items

strReplace.invalid.get()

Arguments

none

Returns

Array: The default list of invalid items

strReplace.invalid.check(str, [invalids])

Arguments

str String: the string to check for invalids

(Optional) invalids Array: A list of invalid items to use instead of the default invalid item list

Returns

Boolean: true Invalids exist in string, false No invalids exist in string

Function

Checks a string to see if it contains any invalid items

strReplace.invalid.remove(str, invalids)

Arguments

str String: the string to remove invalids from

(Optional) invalids Array: A list of invalid items to use instead of the default invalid item list

Returns

String The string with invalid items removed

Function

Removes all occurrences of invalid items within a string