gem-hunter
Language: JavaScript
A simple way to safely do string replacement with React components
A simple way to safely do string replacement with React components. Zero dependencies.
Aka turn a string into an array of React components
npm install react-string-replace # or yarn add react-string-replace # or bun add react-string-replace
First, import the lib. Both require and import are supported.
import reactStringReplace from "react-string-replace"; // OR const reactStringReplace = require("react-string-replace");
Examples will use import since it is more common in the React ecosystem.
import reactStringReplace from 'react-string-replace'; reactStringReplace('whats your name', 'your', (match, i) => ( <span>{match}</span> )); // => [ 'whats ', <span>your</span>, ' name' ]
Highlight all digits within a string by surrounding them in span tags:
reactStringReplace("Apt 111, phone number 5555555555.", /(\d+)/g, (match, i) => ( <span key={i} style={{ color: "red" }}> {match} </span> )); // => // [ // 'Apt ', // <span style={{ color: 'red' }}>111</span>, // ', phone number ', // <span style={{ color: 'red' }}>5555555555</span>, // '.' // ]
import reactStringReplace from "react-string-replace"; function HighlightNumbers() { const content = "Hey my number is 555-555-5555."; return ( <div> {reactStringReplace(content, /(\d+)/g, (match, i) => ( <span key={i} style={{ color: "red" }}> {match} </span> ))} </div> ); }
You can run multiple replacements on one string by calling the function multiple times on the returned result. For instance, if we want to match URLs, @-mentions and hashtags in a string we could do the following:
import reactStringReplace from "react-string-replace"; const text = "Hey @ian_sinn, check out this link https://github.com/iansinnott/ Hope to see you at #reactconf"; let replacedText; // Match URLs replacedText = reactStringReplace(text, /(https?:\/\/\S+)/g, (match, i) => ( <a key={match + i} href={match}> {match} </a> )); // Match @-mentions replacedText = reactStringReplace(replacedText, /@(\w+)/g, (match, i) => ( <a key={match + i} href={`https://twitter.com/${match}`}> @{match} </a> )); // Match hashtags replacedText = reactStringReplace(replacedText, /#(\w+)/g, (match, i) => ( <a key={match + i} href={`https://twitter.com/hashtag/${match}`}> #{match} </a> )); // => [ // 'Hey ', // <a href='https://twitter.com/ian_sinn'>@ian_sinn</a> // ', check out this link ', // <a href='https://github.com/iansinnott/'>https://github.com/iansinnott/</a>, // '. Hope to see you at ', // <a href='https://twitter.com/hashtag/reactconf'>#reactconf</a>, // '', // ];
See the example/ directory for a runnable example.
I wanted an easy way to do string replacement similar to String.prototype.replace within React components without breaking React's built in string escaping and XSS protection. This meant standard string replacement combined with dangerouslySetInnerHTML was out of the question.
Type: string|array
The string or array you would like to do replacement on.
NOTE: When passed an array this is the same as running the replacement on every string within the array. Any non-string values in the array will be left untouched.
Type: regexp|string
The string or RegExp you would like to replace within string.
NOTE: When using a RegExp you MUST include a capturing group. (/(hey)/g is ok, /hey/g is not.)
Example: Replace all occurrences of 'hey' with <span>hey</span>
reactStringReplace("hey hey you", /(hey)/g, () => <span>hey</span>);
Type: function
The replacer function to run each time match is found. This function will be passed the matching string and an index which can be used for adding keys to replacement components if necessary. Character offset identifies the position of match start in the provided text.
const replacementFunction = (match, index, offset) => <span key={index}>{match}</span>; reactStringReplace("hey hey you", /(hey)/g, replacementFunction);
Type: number
The number of substitutions to perform - for example if count is 1, then only the first occurrence of the string will be replaced.
Example: Replace first occurrence of 'hey' with <span>hey</span>
reactStringReplace("hey hey you", "hey", () => <span>hey</span>, 1);
The API is stable and production ready.
v2.0.0 Breaking Change: The index parameter passed to the replacement function now starts at 0 and increments by 1 (previously it started at 1 and incremented by 2).
For details on API tests see the tests file.
MIT © Ian Sinnott