> For the complete documentation index, see [llms.txt](https://osl.mistium.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://osl.mistium.com/methods/strings/search.md).

# Searching & Testing

Methods that inspect a string's contents. Positions are **1-indexed**; "not found" is `0`.

#### `.contains(substr)` → `boolean`

Whether the string contains `substr`.

#### `.containsAny(...subs)` → `boolean`

Whether the string contains any one of the given substrings.

#### `.startsWith(prefix)` → `boolean`

Whether the string begins with `prefix`.

#### `.endsWith(suffix)` → `boolean`

Whether the string ends with `suffix`.

```javascript
log "report.csv".endsWith(".csv")  // true
log "abc".containsAny("x", "b")    // true
```

#### `.index(substr)` → `number`

Position of the first occurrence of `substr` (1-indexed), or `0` if absent.

#### `.lastIndex(substr)` → `number`

Position of the last occurrence (1-indexed), or `0` if absent.

#### `.count(substr)` → `number`

Number of times `substr` appears.

```javascript
log "hello world".index("o")     // 5
log "hello world".lastIndex("o") // 8
log "a-b-c".count("-")           // 2
```