RegExp

Requires the regex feature. Build tish with it for run: cargo run -p tish --features regex -- run main.tish. For compile: tish compile main.tish -o app --feature regex.

RegExp(pattern, flags?)

Create a regular expression. Flags include i (case-insensitive), g (global), etc.

let re = RegExp("\\d+", "g")
let matches = "a1b2".match(re)

String.match(regex)

Match string against regex. Returns array of matches or null.

let re = RegExp("\\w+")
"hello world".match(re)   // ["hello"]

String.replace(search, replacement)

Replace matches. With string search, replaces first occurrence. With RegExp and g flag, replaces all. When replacement is a function and search is a RegExp, the function is invoked for each match with (match, g1, g2, ..., index, fullString).

"hello world".replace("world", "Tish")
"a1b2".replace(RegExp("\\d", "g"), "x")   // "axbx"
"x1y2".replace(RegExp("(\\d)", "g"), (m, d) => "[" + d + "]")   // "x[1]y[2]"

RegExp.exec and match index

exec() returns an array-like object with [0], [1], ... and "index" (match start position).

let m = RegExp("(\\d+)").exec("abc123")
m[0]        // "123"
m["index"]  // 3

Notes

• RegExp support is optional and enabled via the regex feature.
• Without the feature, RegExp, match, and replace with regex are not available.