<?php
$words = ['штаны', 'ёлка', 'слово'];
$regexps = ['~^[а-я]+$~u', '~^[а-яё]+$~u'];
foreach($words as $word)
foreach($regexps as $regexp)
"Regexp: '%s', word: '%s', match: %s\n",
$regexp,
$word,
);
PD9waHAKZXJyb3JfcmVwb3J0aW5nKC0xKTsKJHdvcmRzID0gWyfRiNGC0LDQvdGLJywgJ9GR0LvQutCwJywgJ9GB0LvQvtCy0L4nXTsKJHJlZ2V4cHMgPSBbJ35eW9CwLdGPXSskfnUnLCAnfl5b0LAt0Y/RkV0rJH51J107Cgpmb3JlYWNoKCR3b3JkcyBhcyAkd29yZCkKCWZvcmVhY2goJHJlZ2V4cHMgYXMgJHJlZ2V4cCkKCQlwcmludGYoCgkJCSJSZWdleHA6ICclcycsIHdvcmQ6ICclcycsIG1hdGNoOiAlc1xuIiwKCQkJJHJlZ2V4cCwKCQkJJHdvcmQsCgkJCXByZWdfbWF0Y2goJHJlZ2V4cCwgJHdvcmQpID8gJ3RydWUnIDogJ2ZhbHNlJwoJCSk7
Regexp: '~^[а-я]+$~u', word: 'штаны', match: true
Regexp: '~^[а-яё]+$~u', word: 'штаны', match: true
Regexp: '~^[а-я]+$~u', word: 'ёлка', match: false
Regexp: '~^[а-яё]+$~u', word: 'ёлка', match: true
Regexp: '~^[а-я]+$~u', word: 'слово', match: true
Regexp: '~^[а-яё]+$~u', word: 'слово', match: true